Remove memory category from chrome://tracing

content/child/child_thread_impl.h

Index: content/child/child_thread_impl.h
diff --git a/content/child/child_thread_impl.h b/content/child/child_thread_impl.h
index 4e4270d7df2894933a5fdaa4989fb06148fd96f0..2d1831f1de10545702d350cae2d5ac94ba647677 100644
--- a/content/child/child_thread_impl.h
+++ b/content/child/child_thread_impl.h
@@ -24,10 +24,6 @@
 
 namespace base {
 class MessageLoop;
-
-namespace trace_event {
-class TraceMemoryController;
-}  // namespace trace_event
 }  // namespace base
 
 namespace IPC {
@@ -290,10 +286,6 @@ class CONTENT_EXPORT ChildThreadImpl
   scoped_ptr<ChildDiscardableSharedMemoryManager>
       discardable_shared_memory_manager_;
 
-  // Observes the trace event system. When tracing is enabled, optionally
-  // starts profiling the tcmalloc heap.
-  scoped_ptr<base::trace_event::TraceMemoryController> trace_memory_controller_;
-
   scoped_ptr<base::PowerMonitor> power_monitor_;
 
   scoped_refptr<ChildMessageFilter> geofencing_message_filter_;