Revert r276792 - "Hook PushMessagingMessageFilter up to GCMDriver"

android_webview/browser/aw_browser_context.cc

Index: android_webview/browser/aw_browser_context.cc
diff --git a/android_webview/browser/aw_browser_context.cc b/android_webview/browser/aw_browser_context.cc
index 660e662861e08f7f84537c73e6877b333aa14556..7f76d3fd6baf3f27df6e66e26e30f742a54d7256 100644
--- a/android_webview/browser/aw_browser_context.cc
+++ b/android_webview/browser/aw_browser_context.cc
@@ -318,11 +318,6 @@ quota::SpecialStoragePolicy* AwBrowserContext::GetSpecialStoragePolicy() {
   return NULL;
 }
 
-content::PushMessagingService* AwBrowserContext::GetPushMessagingService() {
-  // TODO(johnme): Support push messaging in WebView.
-  return NULL;
-}
-
 void AwBrowserContext::RebuildTable(
     const scoped_refptr<URLEnumerator>& enumerator) {
   // Android WebView rebuilds from WebChromeClient.getVisitedHistory. The client