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

android_webview/native/aw_contents.cc

Index: android_webview/native/aw_contents.cc
diff --git a/android_webview/native/aw_contents.cc b/android_webview/native/aw_contents.cc
index efa20b2724c0ff55520a5fe9d384684e7425bcb4..be09dc7cfd7bd6e1a38604c8c3e6a7447c87b18f 100644
--- a/android_webview/native/aw_contents.cc
+++ b/android_webview/native/aw_contents.cc
@@ -1093,10 +1093,11 @@ void AwContents::TrimMemory(JNIEnv* env,
 // TODO(sgurun) add support for posting a frame whose name is known (only
 //               main frame is supported at this time, see crbug.com/389721)
 void AwContents::PostMessageToFrame(JNIEnv* env, jobject obj,
-    jstring frame_name, jstring message, jstring source_origin,
-    jstring target_origin, jintArray sent_ports) {
+    jstring frame_name, jstring message, jstring target_origin,
+    jintArray sent_ports) {
 
-  base::string16 j_source_origin(ConvertJavaStringToUTF16(env, source_origin));
+  // Use an empty source origin for android webview.
+  base::string16 source_origin;
   base::string16 j_target_origin(ConvertJavaStringToUTF16(env, target_origin));
   base::string16 j_message(ConvertJavaStringToUTF16(env, message));
   std::vector<int> j_ports;
@@ -1111,7 +1112,7 @@ void AwContents::PostMessageToFrame(JNIEnv* env, jobject obj,
                    j_ports));
   }
   content::MessagePortProvider::PostMessageToFrame(web_contents_.get(),
-                                                   j_source_origin,
+                                                   source_origin,
                                                    j_target_origin,
                                                    j_message,
                                                    j_ports);