Mojo bindings environment: remove usage in gles2.

mojo/gles2/command_buffer_client_impl.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_GLES2_COMMAND_BUFFER_CLIENT_IMPL_H_
 #define MOJO_GLES2_COMMAND_BUFFER_CLIENT_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 23 matching lines @@
 };
 
 class CommandBufferClientImpl
     : public mus::mojom::CommandBufferClient,
       public gpu::CommandBuffer,
       public gpu::GpuControl {
  public:
   explicit CommandBufferClientImpl(
       CommandBufferDelegate* delegate,
       const std::vector<int32_t>& attribs,
-      const MojoAsyncWaiter* async_waiter,
       mojo::ScopedMessagePipeHandle command_buffer_handle);
   ~CommandBufferClientImpl() override;
 
   // CommandBuffer implementation:
   bool Initialize() override;
   State GetLastState() override;
   int32_t GetLastToken() override;
   void Flush(int32_t put_offset) override;
   void OrderingBarrier(int32_t put_offset) override;
   void WaitForTokenInRange(int32_t start, int32_t end) override;
@@ skipping 53 matching lines @@
   mojo::ScopedSharedBufferHandle shared_state_handle_;
   gpu::CommandBufferSharedState* shared_state_;
   int32_t last_put_offset_;
   int32_t next_transfer_buffer_id_;
 
   // Image IDs are allocated in sequence.
   int next_image_id_;
 
   uint64_t next_fence_sync_release_;
   uint64_t flushed_fence_sync_release_;
-
-  const MojoAsyncWaiter* async_waiter_;
 };
 
 }  // gles2
 
 #endif  // MOJO_GLES2_COMMAND_BUFFER_CLIENT_IMPL_H_