Fix a "benign" data race during thread construction

base/message_loop/message_loop.h

Index: base/message_loop/message_loop.h
diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
index 3445a77aa598c7de2159a8f8f5c4add2e376b24a..fbb8309c203275768188b499ef5d5e8102a751e9 100644
--- a/base/message_loop/message_loop.h
+++ b/base/message_loop/message_loop.h
@@ -433,6 +433,10 @@ class BASE_EXPORT MessageLoop : public MessagePump::Delegate {
   // Configure various members and bind this message loop to the current thread.
   void BindToCurrentThread();
 
+  // Sets the ThreadTaskRunnerHandle for the current thread to point to the
+  // task runner for this message loop.
+  void SetThreadTaskRunnerHandle();
+
   // Invokes the actual run loop using the message pump.
   void RunHandler();