Chromecast Android buildfix: fully-qualify AttachCurrentThread.

R=hugo.holgersson@sonymobile.com,lcwu@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/835163003

Cr-Commit-Position: refs/heads/master@{#310172}

chromecast/browser/android/external_video_surface_container_impl.cc

@@ -43,7 +43,7 @@ void ExternalVideoSurfaceContainerImpl::RequestExternalVideoSurface(
 }
 
 int ExternalVideoSurfaceContainerImpl::GetCurrentPlayerId() {
-  JNIEnv* env = AttachCurrentThread();
+  JNIEnv* env = base::android::AttachCurrentThread();
 
   int current_player = static_cast<int>(
       Java_ExternalVideoSurfaceContainer_getCurrentPlayerId(