gpu: Remove gpu channel filter and queue from header.

media/gpu/ipc/service/media_gpu_channel.h

Index: media/gpu/ipc/service/media_gpu_channel.h
diff --git a/media/gpu/ipc/service/media_gpu_channel.h b/media/gpu/ipc/service/media_gpu_channel.h
index 547b26af0428bde292db5950393fe42c656702a2..cbfe59ff2bc93d5c08ffd5f49b0c07052a5e650a 100644
--- a/media/gpu/ipc/service/media_gpu_channel.h
+++ b/media/gpu/ipc/service/media_gpu_channel.h
@@ -7,6 +7,7 @@
 
 #include <memory>
 
+#include "base/memory/weak_ptr.h"

[sandersd (OOO until July 31), 2017/05/11 21:09:18]

Nit: Only needed by the impl.

 #include "base/unguessable_token.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
@@ -24,6 +25,7 @@ class GpuChannel;
 namespace media {
 
 class MediaGpuChannelDispatchHelper;
+class MediaGpuChannelFilter;
 
 class MediaGpuChannel : public IPC::Listener, public IPC::Sender {
  public:
@@ -51,8 +53,9 @@ class MediaGpuChannel : public IPC::Listener, public IPC::Sender {
                             IPC::Message* reply_message);
 
   gpu::GpuChannel* const channel_;
-  base::UnguessableToken channel_token_;
+  scoped_refptr<MediaGpuChannelFilter> filter_;
   std::unique_ptr<GpuJpegDecodeAccelerator> jpeg_decoder_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaGpuChannel);
 };