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

webkit/glue/webkit_glue.h

 // 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.
 
 #ifndef WEBKIT_GLUE_WEBKIT_GLUE_H_
 #define WEBKIT_GLUE_WEBKIT_GLUE_H_
 
 #include "base/basictypes.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include <string>
 #include <vector>
 
 #include "base/platform_file.h"
 #include "base/string16.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebCanvas.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebReferrerPolicy.h"
 #include "webkit/glue/webkit_glue_export.h"
 
 class SkBitmap;
+class SkCanvas;
 
 namespace net {
 class URLRequest;
 }
 
-namespace skia {
-class PlatformCanvas;
-}
-
 namespace WebKit {
 struct WebFileInfo;
 class WebFrame;
 }
 
 namespace webkit_glue {
 
 WEBKIT_GLUE_EXPORT void SetJavaScriptFlags(const std::string& flags);
 
 // Turn on logging for flags in the provided comma delimited list.
@@ skipping 49 matching lines @@
 // Returns true if the plugin thread should terminate the process forcefully
 // instead of exiting cleanly.
 WEBKIT_GLUE_EXPORT bool ShouldForcefullyTerminatePluginProcess();
 
 // File info conversion
 WEBKIT_GLUE_EXPORT void PlatformFileInfoToWebFileInfo(
     const base::PlatformFileInfo& file_info,
     WebKit::WebFileInfo* web_file_info);
 
 // Returns a WebCanvas pointer associated with the given Skia canvas.
-WEBKIT_GLUE_EXPORT WebKit::WebCanvas* ToWebCanvas(skia::PlatformCanvas*);
+WEBKIT_GLUE_EXPORT WebKit::WebCanvas* ToWebCanvas(SkCanvas*);
 
 // Returns the number of currently-active glyph pages this process is using.
 // There can be many such pages (maps of 256 character -> glyph) so this is
 // used to get memory usage statistics.
 WEBKIT_GLUE_EXPORT int GetGlyphPageCount();
 
 // Returns WebKit Web Inspector protocol version.
 std::string GetInspectorProtocolVersion();
 
 // Tells caller whether the given protocol version is supported by the.
 WEBKIT_GLUE_EXPORT bool IsInspectorProtocolVersionSupported(
     const std::string& version);
 
 // Configures the URLRequest according to the referrer policy.
 WEBKIT_GLUE_EXPORT void ConfigureURLRequestForReferrerPolicy(
     net::URLRequest* request, WebKit::WebReferrerPolicy referrer_policy);
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_WEBKIT_GLUE_H_