Use an empty origin as source origin when posting messages from android_webview

android_webview/native/aw_contents.h

 // Copyright (c) 2012 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 ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_H_
 #define ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_H_
 
 #include <jni.h>
 #include <list>
 #include <string>
@@ skipping 204 matching lines @@
   void SetSaveFormData(bool enabled);
 
   // Sets the java client
   void SetAwAutofillClient(jobject client);
 
   void SetJsOnlineProperty(JNIEnv* env, jobject obj, jboolean network_up);
   void TrimMemory(JNIEnv* env, jobject obj, jint level, jboolean visible);
 
   scoped_refptr<AwMessagePortMessageFilter> GetMessagePortMessageFilter();
   void PostMessageToFrame(JNIEnv* env, jobject obj, jstring frame_id,
-      jstring message, jstring source_origin, jstring target_origin,
-      jintArray sent_ports);
+      jstring message, jstring target_origin, jintArray sent_ports);
   void CreateMessageChannel(JNIEnv* env, jobject obj, jobjectArray ports);
 
  private:
   void InitDataReductionProxyIfNecessary();
   void InitAutofillIfNecessary(bool enabled);
 
   // Geolocation API support
   void ShowGeolocationPrompt(const GURL& origin, base::Callback<void(bool)>);
   void HideGeolocationPrompt(const GURL& origin);
 
@@ skipping 20 matching lines @@
   GLViewRendererManager::Key renderer_manager_key_;
 
   DISALLOW_COPY_AND_ASSIGN(AwContents);
 };
 
 bool RegisterAwContents(JNIEnv* env);
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_H_