Refactor MetricsLogChromeOS to ChromeOSMetricsProvider.

chrome/browser/metrics/metrics_log.h

Index: chrome/browser/metrics/metrics_log.h
diff --git a/chrome/browser/metrics/metrics_log.h b/chrome/browser/metrics/metrics_log.h
index f7b2161640ba464cace0b16f9116bf424a2d2706..25102d84e23857f8a7cd2aca608dcd7324195d88 100644
--- a/chrome/browser/metrics/metrics_log.h
+++ b/chrome/browser/metrics/metrics_log.h
@@ -18,10 +18,6 @@
 
 class PrefService;
 
-#if defined(OS_CHROMEOS)
-class MetricsLogChromeOS;
-#endif
-
 namespace base {
 class DictionaryValue;
 }
@@ -113,11 +109,6 @@ class MetricsLog : public metrics::MetricsLogBase {
   virtual void GetFieldTrialIds(
       std::vector<variations::ActiveGroupId>* field_trial_ids) const;
 
-  // Exposed to allow dependency injection for tests.
-#if defined(OS_CHROMEOS)
-  scoped_ptr<MetricsLogChromeOS> metrics_log_chromeos_;
-#endif
-
  private:
   FRIEND_TEST_ALL_PREFIXES(MetricsLogTest, ChromeOSStabilityData);