Make mojo::system::Core not own the PlatformSupport.

mojo/edk/system/channel.h

 // Copyright 2013 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_H_
 #define MOJO_EDK_SYSTEM_CHANNEL_H_
 
 #include <stdint.h>
 
 #include "base/containers/hash_tables.h"
@@ skipping 36 matching lines @@
 // is called, but other threads may have temporarily "dangling" references).
 //
 // Note the lock order (in order of allowable acquisition):
 // |ChannelEndpointClient| (e.g., |MessagePipe|), |ChannelEndpoint|, |Channel|.
 // Thus |Channel| may not call into |ChannelEndpoint| with |Channel|'s lock
 // held.
 class MOJO_SYSTEM_IMPL_EXPORT Channel
     : public base::RefCountedThreadSafe<Channel>,
       public RawChannel::Delegate {
  public:
-  // |platform_support| (typically owned by |Core|) must remain alive until
-  // after |Shutdown()| is called.
+  // |platform_support| must remain alive until after |Shutdown()| is called.
   explicit Channel(embedder::PlatformSupport* platform_support);
 
   // This must be called on the creation thread before any other methods are
   // called, and before references to this object are given to any other
   // threads. |raw_channel| should be uninitialized.
   void Init(scoped_ptr<RawChannel> raw_channel);
 
   // Sets the channel manager associated with this channel. This should be set
   // at most once and only called before |WillShutdownSoon()| (and
   // |Shutdown()|). (This is called by the channel manager when adding a
@@ skipping 184 matching lines @@
   // if/when we wrap).
   RemoteChannelEndpointIdGenerator remote_id_generator_;
 
   DISALLOW_COPY_AND_ASSIGN(Channel);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CHANNEL_H_