Introduce AndroidMetricsProvider class.

chrome/browser/metrics/metrics_service.h

Index: chrome/browser/metrics/metrics_service.h
===================================================================
--- chrome/browser/metrics/metrics_service.h	(revision 272124)
+++ chrome/browser/metrics/metrics_service.h	(working copy)
@@ -36,10 +36,6 @@
 #include "content/public/browser/user_metrics.h"
 #include "net/url_request/url_fetcher_delegate.h"
 
-#if defined(OS_ANDROID)
-#include "chrome/browser/android/activity_type_ids.h"
-#endif
-
 class ChromeBrowserMetricsServiceObserver;
 class MetricsReportingScheduler;
 class PrefService;
@@ -188,9 +184,6 @@
   // At startup, prefs needs to be called with a list of all the pref names and
   // types we'll be using.
   static void RegisterPrefs(PrefRegistrySimple* registry);
-#if defined(OS_ANDROID)
-  static void RegisterPrefsAndroid(PrefRegistrySimple* registry);
-#endif  // defined(OS_ANDROID)
 
   // Set up notifications which indicate that a user is performing work. This is
   // useful to allow some features to sleep, until the machine becomes active,
@@ -223,18 +216,6 @@
   // that session end was successful.
   void RecordCompletedSessionEnd();
 
-#if defined(OS_ANDROID)
-  // Called to log launch and crash stats to preferences.
-  void LogAndroidStabilityToPrefs(PrefService* pref);
-
-  // Converts crash stats stored in the preferences into histograms.
-  void ConvertAndroidStabilityPrefsToHistograms(PrefService* pref);
-
-  // Called when the Activity that the user interacts with is swapped out.
-  void OnForegroundActivityChanged(PrefService* pref,
-                                   ActivityTypeIds::Type type);
-#endif  // defined(OS_ANDROID)
-
 #if defined(OS_ANDROID) || defined(OS_IOS)
   // Called when the application is going into background mode.
   void OnAppEnterBackground();