Flip proprietary codecs to false for Android chromium builds.

android_webview/test/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/rules.gni")
 import("//testing/test.gni")
 
 # Mark all targets as test only.
 testonly = true
 
@@ skipping 47 matching lines @@
     "//v8:v8_external_startup_data_assets",
   ]
   sources = [
     "shell/assets/asset_file.html",
     "shell/assets/asset_icon.png",
     "shell/assets/cookie_test.html",
     "shell/assets/full_screen_video.js",
     "shell/assets/full_screen_video_inside_div_test.html",
     "shell/assets/full_screen_video_test.html",
     "shell/assets/multiple_videos_test.html",
-    "shell/assets/video.mp4",
+    "shell/assets/video.webm",
     "shell/assets/visual_state_during_fullscreen_test.html",
     "shell/assets/visual_state_on_page_commit_visible_test.html",
     "shell/assets/visual_state_waits_for_js_detached_test.html",
     "shell/assets/visual_state_waits_for_js_test.html",
   ]
 }
 
 # GYP: //android_webview/android_webview_tests.gypi:libstandalonelibwebviewchromium
 shared_library("libstandalonelibwebviewchromium") {
   sources = [
@@ skipping 92 matching lines @@
   ]
 }
 
 # GYP: //android_webview/android_webview_tests.gypi:libdrawgl
 shared_library("libdrawgl") {
   sources = [
     "shell/src/draw_gl/draw_gl.cc",
   ]
   configs -= [ "//build/config/android:hide_native_jni_exports" ]
 }