Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/metrics/metrics_log.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
 // This file defines a set of user experience metrics data recorded by
 // the MetricsService.  This is the unit of data that is sent to the server.
 
 #ifndef CHROME_BROWSER_METRICS_METRICS_LOG_H_
 #define CHROME_BROWSER_METRICS_METRICS_LOG_H_
 #pragma once
 
+#include <string>
+#include <vector>
+
 #include "base/basictypes.h"
 #include "chrome/common/metrics_helpers.h"
 
 struct AutocompleteLog;
-class GURL;
 class PrefService;
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace webkit {
 struct WebPluginInfo;
 }
 
@@ skipping 74 matching lines @@
 
   // Writes metrics for the profile identified by key. This writes all
   // key/value pairs in profile_metrics.
   void WriteProfileMetrics(const std::string& key,
                            const base::DictionaryValue& profile_metrics);
 
   DISALLOW_COPY_AND_ASSIGN(MetricsLog);
 };
 
 #endif  // CHROME_BROWSER_METRICS_METRICS_LOG_H_