Revert of video: On ChromeOS don't assume GLX always.

content/browser/media/webrtc_aecdump_browsertest.cc

Index: content/browser/media/webrtc_aecdump_browsertest.cc
diff --git a/content/browser/media/webrtc_aecdump_browsertest.cc b/content/browser/media/webrtc_aecdump_browsertest.cc
index cf98c4bad86924a61a35b52a28fca81fd865303f..f65b1a427869ac809f337a403c17f3e86fbec81c 100644
--- a/content/browser/media/webrtc_aecdump_browsertest.cc
+++ b/content/browser/media/webrtc_aecdump_browsertest.cc
@@ -27,9 +27,6 @@
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     ASSERT_TRUE(CreateTemporaryFileInDir(temp_dir_.path(), &dump_file_));
 
-    // These tests expect pixel output.
-    UseRealGLContexts();
-
     ContentBrowserTest::SetUp();
   }
 
@@ -40,6 +37,10 @@
         switches::kUseFakeDeviceForMediaStream));
     ASSERT_TRUE(CommandLine::ForCurrentProcess()->HasSwitch(
         switches::kUseFakeUIForMediaStream));
+
+    // The video playback will not work without a GPU, so force its use here.
+    // This may not be available on all VMs though.
+    command_line->AppendSwitch(switches::kUseGpuInTests);
 
     // Enable AEC dump with the command line flag.
     command_line->AppendSwitchPath(switches::kEnableWebRtcAecRecordings,