Revert "Don't compile gvariant_ref_unittest.cc with ToT clang"

This reverts commit 80dcfe1.

Reason for revert:
The Clang issue is reported to have been fixed in
llvm/llvm-project#112896

Original change's description:
> Don't compile gvariant_ref_unittest.cc with ToT clang
>
> gvariant_ref_unittest.cc exposes a bug in clang built with asserts (llvm/llvm-project#112352) which may not be fixed soon. This breaks all of the clang ToT bots which build and use clang with asserts. Disable compiling this file under llvm_force_head_revision, which our clang ToT bots set.
>
> Bug: 373478542
> Change-Id: Id56cbc66c455a9480c5ceafe4fb9f0fc6e1bba02
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5941915
> Commit-Queue: Arthur Eubanks <[email protected]>
> Commit-Queue: Erik Jensen <[email protected]>
> Auto-Submit: Arthur Eubanks <[email protected]>
> Reviewed-by: Erik Jensen <[email protected]>
> Cr-Commit-Position: refs/heads/main@{#1370344}

Bug: 373478542
Change-Id: I270b0e13128c528bb5e1fe883c561d18a002551f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5954005
Reviewed-by: Erik Jensen <[email protected]>
Auto-Submit: Hans Wennborg <[email protected]>
Commit-Queue: Erik Jensen <[email protected]>
Reviewed-by: Arthur Eubanks <[email protected]>
Bot-Commit: Rubber Stamper <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1372195}

Author: zmodem

remoting/host/linux/BUILD.gn

@@ -3,7 +3,6 @@
 # found in the LICENSE file.
 
 import("//build/config/c++/c++.gni")
-import("//build/toolchain/toolchain.gni")
 import("//build/config/chromeos/ui_mode.gni")
 import("//remoting/build/config/remoting_build.gni")
 
@@ -185,12 +184,6 @@ source_set("unit_tests") {
     "x_server_clipboard_unittest.cc",
   ]
 
-  # This file causes clang to crash when clang is built with asserts.
-  # TODO(https://crbug.com/373478542): remove workaround once clang is fixed upstream.
-  if (llvm_force_head_revision) {
-    sources -= [ "gvariant_ref_unittest.cc" ]
-  }
-
   if (!remoting_use_x11) {
     sources -= [
       "unicode_to_keysym_unittest.cc",