gfx: Remove Canvas::ExtractImageRep.

ui/gfx/canvas.h

 // Copyright (c) 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 UI_GFX_CANVAS_H_
 #define UI_GFX_CANVAS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 129 matching lines @@
 
   // Returns the default text alignment to be used when drawing text on a
   // Canvas based on the directionality of the system locale language.
   // This function is used by Canvas::DrawStringRect when the text alignment
   // is not specified.
   //
   // This function returns either Canvas::TEXT_ALIGN_LEFT or
   // Canvas::TEXT_ALIGN_RIGHT.
   static int DefaultCanvasTextAlignment();
 
-  // Extracts an ImageSkiaRep from the contents of this canvas.
-  ImageSkiaRep ExtractImageRep() const;
-
   // Draws a dashed rectangle of the specified color.
   void DrawDashedRect(const RectF& rect, SkColor color);
 
   // Unscales by the image scale factor (aka device scale factor), and returns
   // that factor.  This is useful when callers want to draw directly in the
   // native scale.
   float UndoDeviceScaleFactor();
 
   // Saves a copy of the drawing state onto a stack, operating on this copy
   // until a balanced call to Restore() is made.
@@ skipping 306 matching lines @@
   base::Optional<SkBitmap> bitmap_;
   base::Optional<cc::SkiaPaintCanvas> owned_canvas_;
   cc::PaintCanvas* canvas_;
 
   DISALLOW_COPY_AND_ASSIGN(Canvas);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_CANVAS_H_