Update use of SkCanvas and SkDevice to match change in Skia

skia/ext/platform_canvas_win.cc

Index: skia/ext/platform_canvas_win.cc
diff --git a/skia/ext/platform_canvas_win.cc b/skia/ext/platform_canvas_win.cc
index 3495403cd845ac4edc77b7679db2c585a714e943..fe63daf37958c32891c9911f6abd7dd8a718311b 100644
--- a/skia/ext/platform_canvas_win.cc
+++ b/skia/ext/platform_canvas_win.cc
@@ -76,11 +76,8 @@ void CrashIfInvalidSection(HANDLE shared_section) {
 // Restore the optimization options.
 #pragma optimize("", on)
 
-PlatformCanvas::PlatformCanvas() : SkCanvas() {
-}
-
 PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque)
-    : SkCanvas() {
+    : SkCanvas(SkNEW(SkBitmapPlatformDeviceFactory)) {
   bool initialized = initialize(width, height, is_opaque, NULL);
   if (!initialized)
     CrashForBitmapAllocationFailure(width, height);
@@ -90,7 +87,7 @@ PlatformCanvas::PlatformCanvas(int width,
                                int height,
                                bool is_opaque,
                                HANDLE shared_section)
-    : SkCanvas() {
+    : SkCanvas(SkNEW(SkBitmapPlatformDeviceFactory)) {
   bool initialized = initialize(width, height, is_opaque, shared_section);
   if (!initialized) {
     CrashIfInvalidSection(shared_section);
@@ -124,12 +121,4 @@ void PlatformCanvas::endPlatformPaint() {
   // flushing will be done in onAccessBitmap
 }
 
-SkDevice* PlatformCanvas::createDevice(SkBitmap::Config config,
-                                       int width,
-                                       int height,
-                                       bool is_opaque, bool isForLayer) {
-  SkASSERT(config == SkBitmap::kARGB_8888_Config);
-  return BitmapPlatformDevice::create(width, height, is_opaque, NULL);
-}
-
 }  // namespace skia