Made MessagePump a non-thread safe class.

chrome/browser/ui/cocoa/run_loop_testing.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/cocoa/run_loop_testing.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/mac/scoped_nsobject.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_pump_mac.h"
 
 // This class is scheduled with a delayed selector to quit the message pump.
 @interface CocoaQuitTask : NSObject {
  @private
   base::MessagePumpNSRunLoop* pump_;
 }
 - (id)initWithMessagePump:(base::MessagePumpNSRunLoop*)pump;
 - (void)doQuit;
 @end
@@ skipping 10 matching lines @@
   pump_->Quit();
 }
 @end
 
 ////////////////////////////////////////////////////////////////////////////////
 
 namespace chrome {
 namespace testing {
 
 void NSRunLoopRunAllPending() {
-  scoped_refptr<base::MessagePumpNSRunLoop> message_pump(
+  scoped_ptr<base::MessagePumpNSRunLoop> message_pump(
       new base::MessagePumpNSRunLoop);
 
   // Put a delayed selector on the queue. All other pending delayed selectors
   // will run before this, after which the internal loop can end.
   base::scoped_nsobject<CocoaQuitTask> quit_task(
       [[CocoaQuitTask alloc] initWithMessagePump:message_pump.get()]);
 
   [quit_task performSelector:@selector(doQuit)
                   withObject:nil
                   afterDelay:0];
 
   // Spin the internal loop, running it until the quit task is pumped. Pass NULL
   // because there is no delegate MessageLoop; only the Cocoa work queues will
   // be pumped.
   message_pump->Run(NULL);
 }
 
 }  // namespace testing
 }  // namespace chrome