Revert 139433 - Disable accelerated animation

With this change accelerated animation will be disabled by default.

BUG=129934
TEST=manual
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Review URL: https://chromiumcodereview.appspot.com/10459016

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Review URL: https://chromiumcodereview.appspot.com/10456021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@139447 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index c500a88..5b75037 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -456,7 +456,7 @@
   prefs.deferred_2d_canvas_enabled =
       !command_line.HasSwitch(switches::kDisableDeferred2dCanvas);
   prefs.threaded_animation_enabled =
-      command_line.HasSwitch(switches::kEnableThreadedAnimation);
+      !command_line.HasSwitch(switches::kDisableThreadedAnimation);
   prefs.accelerated_painting_enabled =
       GpuProcessHost::gpu_enabled() &&
       command_line.HasSwitch(switches::kEnableAcceleratedPainting);