Made MessagePump a non-thread safe class.

net/dns/serial_worker_unittest.cc

 // 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 "net/dns/serial_worker.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 123 matching lines @@
   std::string breakpoint_;
 };
 
 TEST_F(SerialWorkerTest, ExecuteAndSerializeReads) {
   for (int i = 0; i < 3; ++i) {
     ++input_value_;
     worker_->WorkNow();
     WaitForWork();
     RunUntilBreak("OnWorkFinished");
 
-    message_loop_->AssertIdle();
+    EXPECT_TRUE(message_loop_->IsIdleForTesting());
   }
 
   // Schedule two calls. OnWork checks if it is called serially.
   ++input_value_;
   worker_->WorkNow();
   // read is blocked, so this will have to induce re-work
   worker_->WorkNow();
   WaitForWork();
   WaitForWork();
   RunUntilBreak("OnWorkFinished");
 
   // No more tasks should remain.
-  message_loop_->AssertIdle();
+  EXPECT_TRUE(message_loop_->IsIdleForTesting());
 }
 
 }  // namespace
 
 }  // namespace net