Remove DelegatedFrameData::device_scale_factor

cc/output/delegated_frame_data.h

 // Copyright 2012 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_OUTPUT_DELEGATED_FRAME_DATA_H_
 #define CC_OUTPUT_DELEGATED_FRAME_DATA_H_
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/quads/render_pass.h"
 #include "cc/resources/transferable_resource.h"
 
 namespace cc {
 
 class CC_EXPORT DelegatedFrameData {
  public:
   DelegatedFrameData();
   ~DelegatedFrameData();
 
-  // The device scale factor used when generating this frame.
-  float device_scale_factor;
-
   TransferableResourceArray resource_list;
   RenderPassList render_pass_list;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DelegatedFrameData);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_DELEGATED_FRAME_DATA_H_