cc/paint: Remove PaintCanvas::peekPixels.

cc/paint/skia_paint_canvas.h

 // Copyright 2017 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_PAINT_SKIA_PAINT_CANVAS_H_
 #define CC_PAINT_SKIA_PAINT_CANVAS_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 18 matching lines @@
   explicit SkiaPaintCanvas(const SkBitmap& bitmap);
   explicit SkiaPaintCanvas(const SkBitmap& bitmap, const SkSurfaceProps& props);
   ~SkiaPaintCanvas();
 
   SkMetaData& getMetaData() override;
   SkImageInfo imageInfo() const override;
 
   void flush() override;
 
   SkISize getBaseLayerSize() const override;
-  bool peekPixels(SkPixmap* pixmap) override;
   bool readPixels(const SkImageInfo& dest_info,
                   void* dest_pixels,
                   size_t dest_row_bytes,
                   int src_x,
                   int src_y) override;
   bool readPixels(SkBitmap* bitmap, int src_x, int src_y) override;
   bool readPixels(const SkIRect& srcRect, SkBitmap* bitmap) override;
   bool writePixels(const SkImageInfo& info,
                    const void* pixels,
                    size_t row_bytes,
@@ skipping 118 matching lines @@
   using PaintCanvas::drawImage;
 
  private:
   SkCanvas* canvas_;
   std::unique_ptr<SkCanvas> owned_;
 };
 
 }  // namespace cc
 
 #endif  // CC_PAINT_SKIA_PAINT_CANVAS_H_