ui: Use skia::RefPtr<T> for implicit safe reference counting.

ui/views/painter.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/views/painter.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 30 matching lines @@
   // Overridden from Painter:
   virtual void Paint(gfx::Canvas* canvas, const gfx::Size& size) OVERRIDE {
     SkPaint paint;
     SkPoint p[2];
     p[0].iset(0, 0);
     if (horizontal_)
       p[1].iset(size.width(), 0);
     else
       p[1].iset(0, size.height());
 
-    SkShader* s = SkGradientShader::CreateLinear(p, colors_.get(), pos_.get(),
-        count_, SkShader::kClamp_TileMode, NULL);
+    skia::RefPtr<SkShader> s = skia::AdoptRef(SkGradientShader::CreateLinear(
+        p, colors_.get(), pos_.get(), count_, SkShader::kClamp_TileMode, NULL));
     paint.setStyle(SkPaint::kFill_Style);
-    paint.setShader(s);
+    paint.setShader(s.get());
     // Need to unref shader, otherwise never deleted.
-    s->unref();
 
     canvas->sk_canvas()->drawRectCoords(SkIntToScalar(0), SkIntToScalar(0),
                                         SkIntToScalar(size.width()),
                                         SkIntToScalar(size.height()), paint);
   }
 
  private:
   // If |horizontal_| is true then the gradiant is painted horizontally.
   bool horizontal_;
   // The gradient colors.
@@ skipping 157 matching lines @@
     return;
   }
   canvas->DrawImageInt(*images_[LEFT], 0, 0);
   canvas->DrawImageInt(*images_[RIGHT],
                        size.width() - images_[RIGHT]->width(), 0);
   canvas->TileImageInt(*images_[CENTER], images_[LEFT]->width(), 0,
       size.width() - images_[LEFT]->width() - images_[RIGHT]->width(), height_);
 }
 
 }  // namespace views