Simplify platform_canvas.h by recognizing that PlatformCanvas does not actually extend

content/plugin/webplugin_proxy.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 "content/plugin/webplugin_proxy.h"
 
 #include "build/build_config.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
@@ skipping 464 matching lines @@
     InvalidateRect(damaged_rect_);
   }
 }
 
 #if defined(OS_WIN)
 
 void WebPluginProxy::CreateCanvasFromHandle(
     const TransportDIB::Handle& dib_handle,
     const gfx::Rect& window_rect,
     SkAutoTUnref<skia::PlatformCanvas>* canvas) {
-  canvas->reset(new skia::PlatformCanvas);
-  if (!canvas->get()->initialize(
-          window_rect.width(),
-          window_rect.height(),
-          true,
-          dib_handle)) {
-    canvas->reset(NULL);
-  }
+  canvas->reset(skia::CreatePlatformCanvas(window_rect.width(),
+                                           window_rect.height(),
+                                           true,
+                                           dib_handle,
+                                           skia::RETURN_NULL_ON_FAILURE));
   // The canvas does not own the section so we need to close it now.
   CloseHandle(dib_handle);
 }
 
 void WebPluginProxy::SetWindowlessBuffers(
     const TransportDIB::Handle& windowless_buffer0,
     const TransportDIB::Handle& windowless_buffer1,
     const TransportDIB::Handle& background_buffer,
     const gfx::Rect& window_rect) {
   CreateCanvasFromHandle(windowless_buffer0,
@@ skipping 280 matching lines @@
   int input_type;
   gfx::Rect caret_rect;
   if (!delegate_->GetIMEStatus(&input_type, &caret_rect))
     return;
 
   Send(new PluginHostMsg_NotifyIMEStatus(route_id_, input_type, caret_rect));
 }
 #endif
 
 }  // namespace content