EDK: Move ref counting classes to mojo/edk/util.

mojo/edk/system/channel_endpoint_client.h

 // Copyright 2014 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 MOJO_EDK_SYSTEM_CHANNEL_ENDPOINT_CLIENT_H_
 #define MOJO_EDK_SYSTEM_CHANNEL_ENDPOINT_CLIENT_H_
 
-#include "mojo/edk/system/ref_counted.h"
+#include "mojo/edk/util/ref_counted.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
 namespace system {
 
 class MessageInTransit;
 
 // Interface for receivers of messages from |ChannelEndpoint| (hence from
 // |Channel|). |port| is simply the value passed to |ChannelEndpoint| on
 // construction, and provides a lightweight way for an object to be the client
 // of multiple |ChannelEndpoint|s. (|MessagePipe| implements this interface, in
 // which case |port| is the port number for the |ProxyMessagePipeEndpoint|
 // corresdponding to the |ChannelEndpoint|.)
 //
 // Implementations of this class should be thread-safe. |ChannelEndpointClient|
 // *precedes* |ChannelEndpoint| in the lock order, so |ChannelEndpoint| should
 // never call into this class with its lock held. (Instead, it should take a
 // reference under its lock, release its lock, and make any needed call(s).)
 //
 // Note: As a consequence of this, all the client methods may be called even
 // after |ChannelEndpoint::DetachFromClient()| has been called (so the
 // |ChannelEndpoint| has apparently relinquished its pointer to the
 // |ChannelEndpointClient|).
 class ChannelEndpointClient
-    : public RefCountedThreadSafe<ChannelEndpointClient> {
+    : public util::RefCountedThreadSafe<ChannelEndpointClient> {
  public:
   // Called by |ChannelEndpoint| in response to its |OnReadMessage()|, which is
   // called by |Channel| when it receives a message for the |ChannelEndpoint|.
   // (|port| is the value passed to |ChannelEndpoint|'s constructor as
   // |client_port|.)
   //
   // This should return true if it accepted (and took ownership of) |message|.
   virtual bool OnReadMessage(unsigned port, MessageInTransit* message) = 0;
 
   // Called by |ChannelEndpoint| when the |Channel| is relinquishing its pointer
   // to the |ChannelEndpoint| (and vice versa). After this is called,
   // |OnReadMessage()| will no longer be called.
   virtual void OnDetachFromChannel(unsigned port) = 0;
 
  protected:
   FRIEND_REF_COUNTED_THREAD_SAFE(ChannelEndpointClient);
 
   ChannelEndpointClient() {}
   virtual ~ChannelEndpointClient() {}
 
  private:
   MOJO_DISALLOW_COPY_AND_ASSIGN(ChannelEndpointClient);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CHANNEL_ENDPOINT_CLIENT_H_