Move extension_test_message_listener to extensions.

extensions/test/extension_test_message_listener.h

Index: extensions/test/extension_test_message_listener.h
diff --git a/chrome/browser/extensions/extension_test_message_listener.h b/extensions/test/extension_test_message_listener.h
similarity index 96%
rename from chrome/browser/extensions/extension_test_message_listener.h
rename to extensions/test/extension_test_message_listener.h
index d0d5bbbf936cff72619e437c4d2909e29132e6fb..b2d61326535bc743bfecf7d09aee46411537c81c 100644
--- a/chrome/browser/extensions/extension_test_message_listener.h
+++ b/extensions/test/extension_test_message_listener.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_TEST_MESSAGE_LISTENER_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTENSION_TEST_MESSAGE_LISTENER_H_
+#ifndef EXTENSIONS_TEST_EXTENSION_TEST_MESSAGE_LISTENER_H_
+#define EXTENSIONS_TEST_EXTENSION_TEST_MESSAGE_LISTENER_H_
 
 #include <string>
 
@@ -171,4 +171,4 @@ class ExtensionTestMessageListener : public content::NotificationObserver {
   scoped_refptr<extensions::TestSendMessageFunction> function_;
 };
 
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TEST_MESSAGE_LISTENER_H_
+#endif  // EXTENSIONS_TEST_EXTENSION_TEST_MESSAGE_LISTENER_H_