Move MessagePort implementation from android_webview to content

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 d9af58bce7f111be8b3db65a0f0eacb43b95d90f..85093c1cd915fd1fa09fd3a77dda8b50a5dc0f24 100644
--- a/android_webview/browser/aw_browser_context.cc
+++ b/android_webview/browser/aw_browser_context.cc
@@ -238,14 +238,6 @@ AwURLRequestContextGetter* AwBrowserContext::GetAwURLRequestContext() {
   return url_request_context_getter_.get();
 }
 
-AwMessagePortService* AwBrowserContext::GetMessagePortService() {
-  if (!message_port_service_.get()) {
-    message_port_service_.reset(
-        native_factory_->CreateAwMessagePortService());
-  }
-  return message_port_service_.get();
-}
-
 // Create user pref service
 void AwBrowserContext::InitUserPrefService() {
   user_prefs::PrefRegistrySyncable* pref_registry =