Revert "Create and pass shared-histogram-allocator from browser to renderer."

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 870227cab616327b9efcb1fa2e9b33383f5f1218..7580068dff19cda345e3087b6a0e029e7ebf2f96 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -158,8 +158,6 @@ class CONTENT_EXPORT RenderProcessHostImpl
   void ResumeDeferredNavigation(const GlobalRequestID& request_id) override;
   void NotifyTimezoneChange(const std::string& timezone) override;
   ServiceRegistry* GetServiceRegistry() override;
-  scoped_ptr<base::SharedPersistentMemoryAllocator> TakeMetricsAllocator()
-      override;
   const base::TimeTicks& GetInitTimeForNavigationMetrics() const override;
   bool SubscribeUniformEnabled() const override;
   void OnAddSubscription(unsigned int target) override;
@@ -333,12 +331,6 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // change.
   void UpdateProcessPriority();
 
-  // Creates a PersistentMemoryAllocator and shares it with the renderer
-  // process for it to store histograms from that process. The allocator is
-  // available for extraction by a SubprocesMetricsProvider in order to
-  // report those histograms to UMA.
-  void CreateSharedRendererHistogramAllocator();
-
   // Handle termination of our process.
   void ProcessDied(bool already_dead, RendererClosedDetails* known_details);
 
@@ -517,9 +509,6 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // Whether or not the CHROMIUM_subscribe_uniform WebGL extension is enabled
   bool subscribe_uniform_enabled_;
 
-  // The memory allocator, if any, in which the renderer will write its metrics.
-  scoped_ptr<base::SharedPersistentMemoryAllocator> metrics_allocator_;
-
   bool channel_connected_;
   bool sent_render_process_ready_;