Convert renderer JS memory usage reporting to use Mojo.

chrome/browser/task_manager/task_manager.h

Index: chrome/browser/task_manager/task_manager.h
diff --git a/chrome/browser/task_manager/task_manager.h b/chrome/browser/task_manager/task_manager.h
index d383f455a242e07a30ee49142eba82b893494014..828246b69011d7a56218c86dd7f91a60993ee8b9 100644
--- a/chrome/browser/task_manager/task_manager.h
+++ b/chrome/browser/task_manager/task_manager.h
@@ -281,7 +281,7 @@ class TaskManagerModel : public base::RefCountedThreadSafe<TaskManagerModel> {
   // changes to the model.
   void ModelChanged();
 
-   // Updates the values for all rows.
+  // Updates the values for all rows.
   void Refresh();
 
   void NotifyResourceTypeStats(
@@ -291,10 +291,6 @@ class TaskManagerModel : public base::RefCountedThreadSafe<TaskManagerModel> {
   void NotifyVideoMemoryUsageStats(
       const content::GPUVideoMemoryUsageStats& video_memory_usage_stats);
 
-  void NotifyV8HeapStats(base::ProcessId renderer_id,
-                         size_t v8_memory_allocated,
-                         size_t v8_memory_used);
-
   void NotifyBytesRead(const net::URLRequest& request, int bytes_read);
 
   void RegisterOnDataReadyCallback(const base::Closure& callback);