Remove MessageLoop::current() from ppapi/proxy.

ppapi/proxy/proxy_completion_callback_factory.h

 // Copyright (c) 2012 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.
 
 #ifndef PPAPI_PROXY_PROXY_COMPLETION_CALLBACK_FACTORY_H_
 #define PPAPI_PROXY_PROXY_COMPLETION_CALLBACK_FACTORY_H_
 
 #include <stdint.h>
 
 #include "base/logging.h"
-#include "base/message_loop/message_loop.h"
+#include "base/sequence_checker.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/utility/completion_callback_factory.h"
 
 namespace ppapi {
 namespace proxy {
 
 // This class is just like pp::NonThreadSafeThreadTraits but rather than using
 // pp::Module::core (which doesn't exist), it uses Chrome threads which do.
 class ProxyNonThreadSafeThreadTraits {
  public:
   class RefCount {
    public:
-    RefCount() : ref_(0) {
-#ifndef NDEBUG
-      message_loop_ = base::MessageLoop::current();
-#endif
-    }
+    RefCount() : ref_(0) {}
 
     ~RefCount() {
-#ifndef NDEBUG
-      DCHECK(message_loop_ == base::MessageLoop::current());
-#endif
+      DCHECK(sequence_checker_.CalledOnValidSequence());
     }
 
     int32_t AddRef() {
-#ifndef NDEBUG
-      DCHECK(message_loop_ == base::MessageLoop::current());
-#endif
+      DCHECK(sequence_checker_.CalledOnValidSequence());
       return ++ref_;
     }
 
     int32_t Release() {
-#ifndef NDEBUG
-      DCHECK(message_loop_ == base::MessageLoop::current());
-#endif
+      DCHECK(sequence_checker_.CalledOnValidSequence());
       DCHECK(ref_ > 0);
       return --ref_;
     }
 
    private:
     int32_t ref_;
-#ifndef NDEBUG
-    base::MessageLoop* message_loop_;
-#endif
+    base::SequenceChecker sequence_checker_;
   };
 
   // No-op lock class.
   class Lock {
    public:
     Lock() {}
     ~Lock() {}
 
     void Acquire() {}
     void Release() {}
@@ skipping 14 matching lines @@
   ProxyCompletionCallbackFactory()
       : pp::CompletionCallbackFactory<T, ProxyNonThreadSafeThreadTraits>() {}
   ProxyCompletionCallbackFactory(T* t)
       : pp::CompletionCallbackFactory<T, ProxyNonThreadSafeThreadTraits>(t) {}
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PROXY_COMPLETION_CALLBACK_FACTORY_H_