Add a content API to create a message channel.

content/browser/web_contents/web_contents_android.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_ANDROID_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_ANDROID_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 70 matching lines @@
       bool animate);
   void ShowImeIfNeeded(JNIEnv* env, jobject obj);
   void ScrollFocusedEditableNodeIntoView(JNIEnv* env, jobject obj);
   void SelectWordAroundCaret(JNIEnv* env, jobject obj);
 
   void InsertCSS(JNIEnv* env, jobject jobj, jstring jcss);
   void EvaluateJavaScript(JNIEnv* env,
                           jobject obj,
                           jstring script,
                           jobject callback);
-  void PostMessageToFrame(JNIEnv* env, jobject obj, jstring frame_id,
-      jstring message, jstring source_origin, jstring target_origin);
  private:
   RenderWidgetHostViewAndroid* GetRenderWidgetHostViewAndroid();
 
   WebContents* web_contents_;
   NavigationControllerAndroid navigation_controller_;
   base::android::ScopedJavaGlobalRef<jobject> obj_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_ANDROID_H_