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

chrome/browser/ui/webui/metrics_handler.h

 // Copyright (c) 2011 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 CHROME_BROWSER_UI_WEBUI_METRICS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_METRICS_HANDLER_H_
 
-#include "content/browser/webui/web_ui.h"
+#include "base/compiler_specific.h"
+#include "content/public/browser/web_ui_message_handler.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 // MetricsHandler
 
 // Let the page contents record UMA actions. Only use when you can't do it from
 // C++. For example, we currently use it to let the NTP log the postion of the
 // Most Visited or Bookmark the user clicked on, as we don't get that
 // information through RequestOpenURL. You will need to update the metrics
 // dashboard with the action names you use, as our processor won't catch that
 // information (treat it as RecordComputedMetrics)
 
 namespace base {
 class ListValue;
 }
 
-class MetricsHandler : public WebUIMessageHandler {
+class MetricsHandler : public content::WebUIMessageHandler {
  public:
   MetricsHandler();
   virtual ~MetricsHandler();
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
   // Callback for the "metricsHandler:recordAction" message. This records a
   // user action.
   void HandleRecordAction(const base::ListValue* args);
 
   // TODO(dbeam): http://crbug.com/104338
 
   // Callback for the "metricsHandler:recordInHistogram" message. This records
   // into a histogram. |args| contains the histogram name, the value to record,
   // and the maximum allowed value, which can be at most 4000. The histogram
   // will use at most 100 buckets, one for each 1, 10, or 100 different values,
   // depending on the maximum value.
   void HandleRecordInHistogram(const base::ListValue* args);
 
   // Callback for the "metricsHandler:logEventTime" message.
   void HandleLogEventTime(const base::ListValue* args);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MetricsHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_METRICS_HANDLER_H_