Cleanup: Remove unneeded browser_thread.h includes in contents.

content/browser/android/content_video_view.cc

Index: content/browser/android/content_video_view.cc
===================================================================
--- content/browser/android/content_video_view.cc	(revision 174830)
+++ content/browser/android/content_video_view.cc	(working copy)
@@ -10,7 +10,6 @@
 #include "content/browser/android/media_player_manager_android.h"
 #include "content/common/android/surface_callback.h"
 #include "content/common/android/surface_texture_peer.h"
-#include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_switches.h"
 #include "jni/ContentVideoView_jni.h"
 
@@ -145,4 +144,4 @@
         player->can_seek_forward(), player->can_seek_backward());
 }
 
-} // namespace content
+}  // namespace content