Tab capture: Disable use of FrameSubscriber on Aura until it has an implementation.

BUG=180647,223723

Review URL: https://codereview.chromium.org/12695017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@190520 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/media/web_contents_video_capture_device.cc

@@ -103,7 +103,7 @@ const int kMaxSnapshotsInFlight = 1;
 
 // TODO(nick): Remove this once frame subscription is supported on Aura and
 // Linux.
-#if defined(OS_WIN) || defined(OS_MACOSX)
+#if (defined(OS_WIN) || defined(OS_MACOSX)) && !defined(USE_AURA)
 const bool kAcceleratedSubscriberIsSupported = true;
 #else
 const bool kAcceleratedSubscriberIsSupported = false;