Remove calls to MessageLoop::current() in net.

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/location.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 39 matching lines @@
     output_value_ = input_value_;
 
     { // This lock might be destroyed after work_called_ is signalled.
       base::AutoLock lock(work_lock_);
       work_running_ = false;
     }
     work_called_.Signal();
   }
 
   void OnWorkFinished() {
-    EXPECT_TRUE(message_loop_ == base::MessageLoop::current());
+    EXPECT_TRUE(message_loop_->task_runner()->BelongsToCurrentThread());
     EXPECT_EQ(output_value_, input_value_);
     BreakNow("OnWorkFinished");
   }
 
  protected:
   void BreakCallback(const std::string& breakpoint) {
     breakpoint_ = breakpoint;
     base::MessageLoop::current()->QuitNow();
   }
 
@@ skipping 86 matching lines @@
   RunUntilBreak("OnWorkFinished");
 
   // No more tasks should remain.
   EXPECT_TRUE(message_loop_->IsIdleForTesting());
 }
 
 }  // namespace
 
 }  // namespace net