cc: Make OutputSurface::Reshape abstract

cc/output/software_output_device.cc

 // 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.
 
 #include "cc/output/software_output_device.h"
 
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/gfx/vsync_provider.h"
 
 namespace cc {
 
-SoftwareOutputDevice::SoftwareOutputDevice() : scale_factor_(1.f) {
-}
-
-SoftwareOutputDevice::~SoftwareOutputDevice() {}
+SoftwareOutputDevice::SoftwareOutputDevice() = default;
+SoftwareOutputDevice::~SoftwareOutputDevice() = default;
 
 void SoftwareOutputDevice::Resize(const gfx::Size& viewport_pixel_size,
                                   float scale_factor) {
-  scale_factor_ = scale_factor;
-
   if (viewport_pixel_size_ == viewport_pixel_size)
     return;
 
   SkImageInfo info = SkImageInfo::MakeN32(viewport_pixel_size.width(),
                                           viewport_pixel_size.height(),
                                           kOpaque_SkAlphaType);
   viewport_pixel_size_ = viewport_pixel_size;
   surface_ = SkSurface::MakeRaster(info);
 }
 
 SkCanvas* SoftwareOutputDevice::BeginPaint(const gfx::Rect& damage_rect) {
   damage_rect_ = damage_rect;
   return surface_ ? surface_->getCanvas() : nullptr;
 }
 
 void SoftwareOutputDevice::EndPaint() {}
 
 gfx::VSyncProvider* SoftwareOutputDevice::GetVSyncProvider() {
   return vsync_provider_.get();
 }
 
 }  // namespace cc