Split out MetricsServiceAccessor out of ChromeMetricsServiceAccessor.

chrome/browser/metrics/chrome_metrics_service_accessor.h

Index: chrome/browser/metrics/chrome_metrics_service_accessor.h
diff --git a/chrome/browser/metrics/chrome_metrics_service_accessor.h b/chrome/browser/metrics/chrome_metrics_service_accessor.h
index d989f5d3ba72b5cc0b97afbe794d25d3cceb306c..a891f27c5e62918a717675e74c2cd1b2d170903c 100644
--- a/chrome/browser/metrics/chrome_metrics_service_accessor.h
+++ b/chrome/browser/metrics/chrome_metrics_service_accessor.h
@@ -7,9 +7,9 @@
 
 #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 {
@@ -34,7 +34,7 @@ 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;
@@ -62,11 +62,6 @@ class ChromeMetricsServiceAccessor {
   // 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);
 };