Return NULL from base::Thread::message_loop_proxy() when thread is not started.

base/threading/thread.h

Index: base/threading/thread.h
diff --git a/base/threading/thread.h b/base/threading/thread.h
index be8cc8f97a503a7a659ae862dfe9e53bc904a280..b96a1fcb36a14a2b5fe51764d19f32c7fa0dff8b 100644
--- a/base/threading/thread.h
+++ b/base/threading/thread.h
@@ -119,7 +119,7 @@ class BASE_EXPORT Thread : PlatformThread::Delegate {
   // is gone.
   // TODO(sanjeevr): Look into merging MessageLoop and MessageLoopProxy.

[willchan no longer on Chromium, 2012/05/04 19:00:57]

Can you delete this comment? They aren't gonna be merged.

[Do not use (sergeyu), 2012/05/04 21:01:36]

Done.

   scoped_refptr<MessageLoopProxy> message_loop_proxy() const {
-    return message_loop_->message_loop_proxy();
+    return message_loop_ ? message_loop_->message_loop_proxy() : NULL;
   }
 
   // Returns the name of this thread (for display in debugger too).