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

chrome/browser/ui/webui/policy_ui.h

Index: chrome/browser/ui/webui/policy_ui.h
===================================================================
--- chrome/browser/ui/webui/policy_ui.h	(revision 116051)
+++ chrome/browser/ui/webui/policy_ui.h	(working copy)
@@ -11,13 +11,14 @@
 #include "chrome/browser/policy/cloud_policy_subsystem.h"
 #include "chrome/browser/policy/configuration_policy_reader.h"
 #include "chrome/browser/ui/webui/chrome_web_ui.h"
+#include "content/public/browser/web_ui_message_handler.h"
 
 namespace policy {
 class CloudPolicyDataStore;
 }
 
 // The base class handler of Javascript messages of the about:policy page.
-class PolicyUIHandler : public WebUIMessageHandler,
+class PolicyUIHandler : public content::WebUIMessageHandler,
                         public policy::PolicyStatus::Observer {
  public:
   PolicyUIHandler();