[android] Update minimum supported OS version to 10

Chrome currently supports Android Oreo and Pie, but as of this CL, a UI
will be presented to users running on Android Oreo and Android Pie.
Whether this message is shown or not is possible override from a server
side configuration.

Bug: 425948259
Change-Id: I9de32db032f7113788eef12b9f701f911f17c53d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6598935
Auto-Submit: Peter Wen <[email protected]>
Commit-Queue: Henrique Nakashima <[email protected]>
Commit-Queue: Peter Wen <[email protected]>
Reviewed-by: Henrique Nakashima <[email protected]>
Reviewed-by: Tommy Nyquist <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1475756}
NOKEYCHECK=True
GitOrigin-RevId: 1d7f198c95b4140cfc729a1d448cabb4efaafbab

Author: Peter Wen

config/android/config.gni

@@ -73,13 +73,7 @@ if (is_android) {
 
     # The default to use for android:minSdkVersion for targets that do
     # not explicitly set it.
-    default_min_sdk_version = 26
-    if (is_asan) {
-      default_min_sdk_version = 27
-    }
-    if (enable_javaless_renderers) {
-      default_min_sdk_version = 29
-    }
+    default_min_sdk_version = 29
 
     # Static analysis can be either "on" or "off" or "build_server". This
     # controls how android lint, error-prone, bytecode checks are run. This