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

ui/native_theme/native_theme_win.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/native_theme_win.h"
 
 #include <windows.h>
 #include <uxtheme.h>
 #include <vsstyle.h>
 #include <vssym32.h>
@@ skipping 63 matching lines @@
   // then copy it to another bitmap.  The temporary bitmap doesn't take
   // ownership of the pixel data, and so will point to garbage when this
   // function returns.  The copy will copy the pixel data into a place owned by
   // the bitmap, which is in turn owned by the shader, etc., so it will live
   // until we're done using it.
   SkBitmap temp_bitmap;
   temp_bitmap.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
   temp_bitmap.setPixels(buffer);
   SkBitmap bitmap;
   temp_bitmap.copyTo(&bitmap, temp_bitmap.config());
-  SkShader* shader = SkShader::CreateBitmapShader(bitmap,
-                                                  SkShader::kRepeat_TileMode,
-                                                  SkShader::kRepeat_TileMode);
+  skia::RefPtr<SkShader> shader = SkShader::CreateBitmapShader(
+      bitmap, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
 
   // Align the pattern with the upper corner of |align_rect|.
   SkMatrix matrix;
   matrix.setTranslate(SkIntToScalar(align_rect.left),
                       SkIntToScalar(align_rect.top));
   shader->setLocalMatrix(matrix);
-  SkSafeUnref(paint->setShader(shader));
+  paint->setShader(shader.get());
 }
 
 //    <-a->
 // [  *****             ]
 //  ____ |              |
 //  <-a-> <------b----->
 // a: object_width
 // b: frame_width
 // *: animating object
 //
@@ skipping 398 matching lines @@
                                    Part part,
                                    State state,
                                    const gfx::Rect& rect,
                                    const ExtraParams& extra) const {
   // TODO(asvitkine): This path is pretty inefficient - for each paint operation
   //                  it creates a new offscreen bitmap Skia canvas. This can
   //                  be sped up by doing it only once per part/state and
   //                  keeping a cache of the resulting bitmaps.
 
   // Create an offscreen canvas that is backed by an HDC.
-  skia::BitmapPlatformDevice* device = skia::BitmapPlatformDevice::Create(
-      rect.width(), rect.height(), false, NULL);
+  skia::RefPtr<skia::BitmapPlatformDevice> device =
+      skia::BitmapPlatformDevice::Create(
+          rect.width(), rect.height(), false, NULL);
   DCHECK(device);
-  SkCanvas offscreen_canvas(device);
-  device->unref();
+  SkCanvas offscreen_canvas(device.get());
   DCHECK(skia::SupportsPlatformPaint(&offscreen_canvas));
 
   // Some of the Windows theme drawing operations do not write correct alpha
   // values for fully-opaque pixels; instead the pixels get alpha 0. This is
   // especially a problem on Windows XP or when using the Classic theme.
   //
   // To work-around this, mark all pixels with a placeholder value, to detect
   // which pixels get touched by the paint operation. After paint, set any
   // pixels that have alpha 0 to opaque and placeholders to fully-transparent.
   const SkColor placeholder = SkColorSetARGB(1, 0, 0, 0);
@@ skipping 1431 matching lines @@
     handle = open_theme_(NULL, L"Spin");
     break;
   default:
     NOTREACHED();
   }
   theme_handles_[theme_name] = handle;
   return handle;
 }
 
 }  // namespace ui