Move WebUIMessageHandler to its own file in the public directory and put it in the content namesp...

chrome/browser/ui/webui/web_ui_test_handler.h

Index: chrome/browser/ui/webui/web_ui_test_handler.h
===================================================================
--- chrome/browser/ui/webui/web_ui_test_handler.h	(revision 116051)
+++ chrome/browser/ui/webui/web_ui_test_handler.h	(working copy)
@@ -6,18 +6,19 @@
 #define CHROME_BROWSER_UI_WEBUI_WEB_UI_TEST_HANDLER_H_
 #pragma once
 
+#include "base/compiler_specific.h"
 #include "base/string16.h"
-#include "content/browser/webui/web_ui.h"
 #include "content/public/browser/notification_observer.h"
+#include "content/public/browser/web_ui_message_handler.h"
 
+class RenderViewHost;
+
 namespace base {
-
 class ListValue;
-
 }  // namespace base
 
 // This class registers test framework specific handlers on WebUI objects.
-class WebUITestHandler : public WebUIMessageHandler,
+class WebUITestHandler : public content::WebUIMessageHandler,
                          public content::NotificationObserver {
  public:
   WebUITestHandler();