Auto merge of servo#29970 - mrobinson:remove-uwp, r=jdm

Remove UWP / Hololens support

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---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because they remove a feature.

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Author: bors-servo

.gitignore

@@ -55,22 +55,6 @@ Sessionx.vim
 
 /unminified-js
 
-# Hololens artifacts
-support/hololens/x64/
-support/hololens/ARM/
-support/hololens/ARM64/
-support/hololens/ServoApp/x64/
-support/hololens/ServoApp/ARM/
-support/hololens/ServoApp/ARM64/
-support/hololens/ServoApp/Generated Files/
-support/hololens/ServoApp/BundleArtifacts/
-support/hololens/ServoApp/support/
-support/hololens/ServoApp/Debug/
-support/hololens/ServoApp/Release/
-support/hololens/packages/
-support/hololens/AppPackages/
-support/hololens/.vs/
-
 # Layout debugger trace files
 layout_trace*
 

Cargo.lock

@@ -44,7 +44,7 @@ manually, try the [manual build setup][manual-build].
  - Download and run [`rustup-init.exe`](https://win.rustup.rs/) then follow the onscreen instructions.
  - Install [chocolatey](https://chocolatey.org/)
  - Run `mach bootstrap`
-  - *This will install CMake, Git, Ninja, NuGet, Python and the Visual Studio 2019 Build Tools
+  - *This will install CMake, Git, Ninja, Python and the Visual Studio 2019 Build Tools
      via choco in an Administrator console. It can take quite a while.*
   - *If you already have Visual Studio 2019 installed, this may not install all necessary components.
      Please follow the Visual Studio 2019 installation instructions in the [manual setup][manual-build].*

README.md

@@ -6,9 +6,6 @@ license = "MPL-2.0"
 edition = "2018"
 publish = false
 
-[features]
-uwp = []
-
 [lib]
 name = "servo_config"
 path = "lib.rs"

Xargo.toml

@@ -35,14 +35,9 @@ pub fn default_config_dir() -> Option<PathBuf> {
     Some(config_dir)
 }
 
-#[cfg(all(target_os = "windows", not(feature = "uwp")))]
+#[cfg(all(target_os = "windows"))]
 pub fn default_config_dir() -> Option<PathBuf> {
     let mut config_dir = ::dirs_next::config_dir().unwrap();
     config_dir.push("Servo");
     Some(config_dir)
 }
-
-#[cfg(all(target_os = "windows", feature = "uwp"))]
-pub fn default_config_dir() -> Option<PathBuf> {
-    None
-}

components/config/Cargo.toml

@@ -244,7 +244,7 @@ fn test_set_all_error_on_unknown_field() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
-#[cfg(not(any(target_os = "android", feature = "uwp")))]
+#[cfg(not(target_os = "android"))]
 #[test]
 fn test_default_config_dir_create_read_write() {
     let json_str = "{\

components/config/basedir.rs

@@ -21,7 +21,6 @@ default = ["unrooted_must_root_lint"]
 webgl_backtrace = ["canvas_traits/webgl_backtrace"]
 js_backtrace = []
 refcell_backtrace = ["accountable-refcell"]
-uwp = ["js/uwp"]
 xr-profile = ["webxr-api/profile"]
 
 [build-dependencies]

components/config/tests/prefs.rs

@@ -26,7 +26,6 @@ no-wgl = ["canvas/no-wgl"]
 no_static_freetype = ["webrender/no_static_freetype"]
 profilemozjs = ["script/profilemozjs"]
 refcell_backtrace = ["script/refcell_backtrace"]
-uwp = ["servo_config/uwp", "script/uwp"]
 webdriver = ["webdriver_server"]
 webgl_backtrace = [
     "script/webgl_backtrace",

components/script/Cargo.toml

@@ -141,49 +141,14 @@ mod media_platform {
     use super::ServoMedia;
     use servo_media_gstreamer::GStreamerBackend;
 
-    #[cfg(feature = "uwp")]
-    fn set_gstreamer_log_handler() {
-        use gstreamer::{debug_add_log_function, DebugLevel};
-
-        debug_add_log_function(|cat, level, file, function, line, _, message| {
-            let message = format!(
-                "{:?} {:?} {:?}:{:?}:{:?} {:?}",
-                cat.get_name(),
-                level,
-                file,
-                line,
-                function,
-                message
-            );
-            match level {
-                DebugLevel::Debug => debug!("{}", message),
-                DebugLevel::Error => error!("{}", message),
-                DebugLevel::Warning => warn!("{}", message),
-                DebugLevel::Fixme | DebugLevel::Info => info!("{}", message),
-                DebugLevel::Memdump | DebugLevel::Count | DebugLevel::Trace => {
-                    trace!("{}", message)
-                },
-                _ => (),
-            }
-        });
-    }
-
     #[cfg(any(windows, target_os = "macos"))]
     pub fn init() {
-        // UWP apps have the working directory set appropriately. Win32 apps
-        // do not and need some assistance finding the DLLs.
-        let plugin_dir = if cfg!(feature = "uwp") {
-            std::path::PathBuf::new()
-        } else {
-            let mut plugin_dir = std::env::current_exe().unwrap();
-            plugin_dir.pop();
+        let mut plugin_dir = std::env::current_exe().unwrap();
+        plugin_dir.pop();
 
-            if cfg!(target_os = "macos") {
-                plugin_dir.push("lib");
-            }
-
-            plugin_dir
-        };
+        if cfg!(target_os = "macos") {
+            plugin_dir.push("lib");
+        }
 
         let backend = match GStreamerBackend::init_with_plugins(
             plugin_dir,
@@ -196,10 +161,6 @@ mod media_platform {
             },
         };
         ServoMedia::init_with_backend(backend);
-        #[cfg(feature = "uwp")]
-        {
-            set_gstreamer_log_handler();
-        }
     }
 
     #[cfg(not(any(windows, target_os = "macos")))]