cc: Remove SetLayerTreeHostClientReady()

cc/trees/proxy_impl.h

 // Copyright 2015 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 CC_TREES_PROXY_IMPL_H_
 #define CC_TREES_PROXY_IMPL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
 
 // TODO(khushalsagar): The impl side of ThreadProxy. It is currently defined as
 // an interface with the implementation provided by ThreadProxy and will be
 // made an independent class.
 // The methods added to this interface should only use the CompositorThreadOnly
 // variables from ThreadProxy.
 // See crbug/527200
 class CC_EXPORT ProxyImpl {
  public:
   // Callback for impl side commands received from the channel.
   virtual void SetThrottleFrameProductionOnImpl(bool throttle) = 0;
-  virtual void SetLayerTreeHostClientReadyOnImpl() = 0;
 
   // TODO(khushalsagar): Rename as GetWeakPtr() once ThreadProxy is split.
   virtual base::WeakPtr<ProxyImpl> GetImplWeakPtr() = 0;
 
  protected:
   virtual ~ProxyImpl() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_IMPL_H_