Made MessagePump a non-thread safe class.

chrome/browser/ui/cocoa/run_loop_testing.mm

Index: chrome/browser/ui/cocoa/run_loop_testing.mm
diff --git a/chrome/browser/ui/cocoa/run_loop_testing.mm b/chrome/browser/ui/cocoa/run_loop_testing.mm
index 9918c90a4ccd4081b69a6558bb1f9989259463c0..927e440a4e1ca16cb9fb1ded076ec95b29934478 100644
--- a/chrome/browser/ui/cocoa/run_loop_testing.mm
+++ b/chrome/browser/ui/cocoa/run_loop_testing.mm
@@ -7,6 +7,7 @@
 #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.
@@ -37,13 +38,13 @@ 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]);
+      [[CocoaQuitTask alloc] initWithMessagePump:message_pump.get()]);
 
   [quit_task performSelector:@selector(doQuit)
                   withObject:nil