ui: Eliminate allocating gfx::Canvas on the heap for every view.

ui/native_theme/common_theme.cc

 // 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.
 
 #include "ui/native_theme/common_theme.h"
 
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
@@ skipping 203 matching lines @@
   }
   canvas->drawRect(gfx::RectToSkRect(rect), paint);
 }
 
 // static
 scoped_ptr<gfx::Canvas> CommonThemeCreateCanvas(SkCanvas* sk_canvas) {
   // TODO(pkotwicz): Do something better and don't infer device
   // scale factor from canvas scale.
   SkMatrix m = sk_canvas->getTotalMatrix();
   float device_scale = static_cast<float>(SkScalarAbs(m.getScaleX()));
-  return make_scoped_ptr(
-      gfx::Canvas::CreateCanvasWithoutScaling(sk_canvas, device_scale));
+  return make_scoped_ptr(new gfx::Canvas(sk_canvas, device_scale));
 }
 
 }  // namespace ui