Update use of SkCanvas and SkDevice to match change in Skia

skia/ext/platform_canvas.h

Index: skia/ext/platform_canvas.h
diff --git a/skia/ext/platform_canvas.h b/skia/ext/platform_canvas.h
index 1863d77a7586606f28e04d7579b0f168bbdd38be..b602ed46ca3e3aa3417ec7761c0eb9a617c1701d 100644
--- a/skia/ext/platform_canvas.h
+++ b/skia/ext/platform_canvas.h
@@ -18,10 +18,11 @@ namespace skia {
 // using both Skia operations and platform-specific operations.
 class PlatformCanvas : public SkCanvas {
  public:
-  // Set is_opaque if you are going to erase the bitmap and not use
-  // transparency: this will enable some optimizations.
   // If you use the version with no arguments, you MUST call initialize()
   PlatformCanvas();
+  explicit PlatformCanvas(SkDeviceFactory* factory);
+  // Set is_opaque if you are going to erase the bitmap and not use
+  // transparency: this will enable some optimizations.
   PlatformCanvas(int width, int height, bool is_opaque);
   virtual ~PlatformCanvas();
 
@@ -96,16 +97,6 @@ class PlatformCanvas : public SkCanvas {
   // FIXME(brettw) is this necessary?
   using SkCanvas::clipRect;
 
- protected:
-  // Creates a device store for use by the canvas. We override this so that
-  // the device is always our own so we know that we can use platform
-  // operations on it.
-  virtual SkDevice* createDevice(SkBitmap::Config,
-                                 int width,
-                                 int height,
-                                 bool is_opaque,
-                                 bool isForLayer);
-
  private:
   // Unimplemented. This is to try to prevent people from calling this function
   // on SkCanvas. SkCanvas' version is not virtual, so we can't prevent this