Split out MetricsServiceAccessor out of ChromeMetricsServiceAccessor.

chrome/browser/metrics/chrome_metrics_service_accessor.h

 // Copyright 2014 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_METRICS_CHROME_METRICS_SERVICE_ACCESSOR_H_
 #define CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_ACCESSOR_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
+#include "chrome/browser/metrics/metrics_service_accessor.h"
 
 class ChromeBrowserMetricsServiceObserver;
-class MetricsServiceObserver;
 class Profile;
 
 namespace {
 class CrashesDOMHandler;
 class FlashDOMHandler;
 }
 
 namespace extensions {
 class ExtensionDownloader;
 class ManifestFetchData;
 class MetricsPrivateGetIsCrashReportingEnabledFunction;
 }
 
 namespace prerender {
 bool IsOmniboxEnabled(Profile* profile);
 }
 
 namespace system_logs {
 class ChromeInternalLogSource;
 }
 
 // This class limits and documents access to metrics service helper methods.
 // Since these methods are private, each user has to be explicitly declared
 // as a 'friend' below.
-class ChromeMetricsServiceAccessor {
+class ChromeMetricsServiceAccessor : public MetricsServiceAccessor {
  private:
   friend bool prerender::IsOmniboxEnabled(Profile* profile);
   friend class ::ChromeBrowserMetricsServiceObserver;
   friend class ChromeRenderMessageFilter;
   friend class ::CrashesDOMHandler;
   friend class extensions::ExtensionDownloader;
   friend class extensions::ManifestFetchData;
   friend class extensions::MetricsPrivateGetIsCrashReportingEnabledFunction;
   friend class ::FlashDOMHandler;
   friend class system_logs::ChromeInternalLogSource;
 
   FRIEND_TEST_ALL_PREFIXES(ChromeMetricsServiceAccessorTest,
                            MetricsReportingEnabled);
   FRIEND_TEST_ALL_PREFIXES(ChromeMetricsServiceAccessorTest,
                            CrashReportingEnabled);
 
   // Returns true if prefs::kMetricsReportingEnabled is set.
   // TODO(asvitkine): Consolidate the method in MetricsStateManager.
   // TODO(asvitkine): This function does not report the correct value on
   // Android and ChromeOS, see http://crbug.com/362192.
   static bool IsMetricsReportingEnabled();
 
   // Returns true if crash reporting is enabled.  This is set at the platform
   // level for Android and ChromeOS, and otherwise is the same as
   // IsMetricsReportingEnabled for desktop Chrome.
   static bool IsCrashReportingEnabled();
 
-  // Registers/unregisters |observer| to receive MetricsLog notifications
-  // from metrics service.
-  static void AddMetricsServiceObserver(MetricsServiceObserver* observer);
-  static void RemoveMetricsServiceObserver(MetricsServiceObserver* observer);
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChromeMetricsServiceAccessor);
 };
 
 #endif  // CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_ACCESSOR_H_