Refactor HashedExtensionMetrics into ExtensionsMetricsProvider.

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 b22aefdf06d41510ea585c5a921e92dbc56b9edc..f7b2161640ba464cace0b16f9116bf424a2d2706 100644
--- a/chrome/browser/metrics/metrics_log.h
+++ b/chrome/browser/metrics/metrics_log.h
@@ -12,12 +12,10 @@
 #include <vector>
 
 #include "base/basictypes.h"
-#include "chrome/browser/metrics/extension_metrics.h"
 #include "chrome/common/variations/variations_util.h"
 #include "components/metrics/metrics_log_base.h"
 #include "ui/gfx/size.h"
 
-class HashedExtensionMetrics;
 class PrefService;
 
 #if defined(OS_CHROMEOS)
@@ -149,9 +147,6 @@ class MetricsLog : public metrics::MetricsLogBase {
   // The time when the current log was created.
   const base::TimeTicks creation_time_;
 
-  // For including information on which extensions are installed in reports.
-  HashedExtensionMetrics extension_metrics_;
-
   DISALLOW_COPY_AND_ASSIGN(MetricsLog);
 };