Eliminate skia::PlatformCanvas - Step 1

webkit/plugins/ppapi/ppapi_plugin_instance.cc

Index: webkit/plugins/ppapi/ppapi_plugin_instance.cc
===================================================================
--- webkit/plugins/ppapi/ppapi_plugin_instance.cc	(revision 80026)
+++ webkit/plugins/ppapi/ppapi_plugin_instance.cc	(working copy)
@@ -1229,9 +1229,11 @@
 #elif defined(OS_WIN)
   // On Windows, we now need to render the PDF to the DC that backs the
   // supplied canvas.
+  skia::PlatformCanvas* platform_canvas =
+      static_cast<skia::PlatformCanvas*>(canvas);
   skia::VectorPlatformDevice& device =
       static_cast<skia::VectorPlatformDevice&>(
-          canvas->getTopPlatformDevice());
+          platform_canvas->getTopPlatformDevice());
   HDC dc = device.getBitmapDC();
   gfx::Size size_in_pixels;
   size_in_pixels.set_width(
@@ -1320,9 +1322,11 @@
     const SkBitmap& bitmap,
     const gfx::Rect& printable_area,
     WebKit::WebCanvas* canvas) {
+  skia::PlatformCanvas* platform_canvas =
+      static_cast<skia::PlatformCanvas*>(canvas);
   skia::VectorPlatformDevice& device =
       static_cast<skia::VectorPlatformDevice&>(
-          canvas->getTopPlatformDevice());
+          platform_canvas->getTopPlatformDevice());
   HDC dc = device.getBitmapDC();
   // TODO(sanjeevr): This is a temporary hack. If we output a JPEG
   // to the EMF, the EnumEnhMetaFile call fails in the browser