Remove memory category from chrome://tracing

content/browser/browser_main_loop.h

Index: content/browser/browser_main_loop.h
diff --git a/content/browser/browser_main_loop.h b/content/browser/browser_main_loop.h
index 3f037b7bf6331c9c84a2ff045f5013ec60ce65c1..07c95aea557800a195e0f4e5fc0c39cd910bf738 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -22,7 +22,6 @@ class PowerMonitor;
 class SystemMonitor;
 class MemoryPressureMonitor;
 namespace trace_event {
-class TraceMemoryController;
 class TraceEventSystemStatsMonitor;
 }  // namespace trace_event
 }  // namespace base
@@ -207,7 +206,6 @@ class CONTENT_EXPORT BrowserMainLoop {
 #endif
 
   scoped_ptr<MemoryObserver> memory_observer_;
-  scoped_ptr<base::trace_event::TraceMemoryController> trace_memory_controller_;
 
   // Members initialized in |InitStartupTracingForDuration()| ------------------
   base::FilePath startup_trace_file_;