Revert of base: Remove use of MessageLoopProxy

base/trace_event/trace_event_memory.cc

Index: base/trace_event/trace_event_memory.cc
diff --git a/base/trace_event/trace_event_memory.cc b/base/trace_event/trace_event_memory.cc
index ab8ba0d33373ed1c7ef2d421b72edb5a5cb3b00f..2bf6d38beab0d8659aa92729baee7e61327fddac 100644
--- a/base/trace_event/trace_event_memory.cc
+++ b/base/trace_event/trace_event_memory.cc
@@ -6,10 +6,9 @@
 
 #include "base/debug/leak_annotations.h"
 #include "base/lazy_instance.h"
-#include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/single_thread_task_runner.h"
+#include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_local_storage.h"
@@ -145,11 +144,11 @@
 //////////////////////////////////////////////////////////////////////////////
 
 TraceMemoryController::TraceMemoryController(
-    scoped_refptr<SingleThreadTaskRunner> task_runner,
+    scoped_refptr<MessageLoopProxy> message_loop_proxy,
     HeapProfilerStartFunction heap_profiler_start_function,
     HeapProfilerStopFunction heap_profiler_stop_function,
     GetHeapProfileFunction get_heap_profile_function)
-    : task_runner_(task_runner.Pass()),
+    : message_loop_proxy_(message_loop_proxy),
       heap_profiler_start_function_(heap_profiler_start_function),
       heap_profiler_stop_function_(heap_profiler_stop_function),
       get_heap_profile_function_(get_heap_profile_function),
@@ -175,9 +174,10 @@
   if (!enabled)
     return;
   DVLOG(1) << "OnTraceLogEnabled";
-  task_runner_->PostTask(FROM_HERE,
-                         base::Bind(&TraceMemoryController::StartProfiling,
-                                    weak_factory_.GetWeakPtr()));
+  message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&TraceMemoryController::StartProfiling,
+                 weak_factory_.GetWeakPtr()));
 }
 
 void TraceMemoryController::OnTraceLogDisabled() {
@@ -185,9 +185,10 @@
   // called, so we cannot tell if it was enabled before. Always try to turn
   // off profiling.
   DVLOG(1) << "OnTraceLogDisabled";
-  task_runner_->PostTask(FROM_HERE,
-                         base::Bind(&TraceMemoryController::StopProfiling,
-                                    weak_factory_.GetWeakPtr()));
+  message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&TraceMemoryController::StopProfiling,
+                 weak_factory_.GetWeakPtr()));
 }
 
 void TraceMemoryController::StartProfiling() {