Move the WebPluginResourceClient interface to its own header. Also fix up method order in webplugin…

content/child/npapi/webplugin_delegate_impl_gtk.cc

Index: content/child/npapi/webplugin_delegate_impl_gtk.cc
===================================================================
--- content/child/npapi/webplugin_delegate_impl_gtk.cc	(revision 220951)
+++ content/child/npapi/webplugin_delegate_impl_gtk.cc	(working copy)
@@ -95,8 +95,7 @@
   // Nothing to do here.
 }
 
-void WebPluginDelegateImpl::Paint(WebKit::WebCanvas* canvas,
-                                  const gfx::Rect& rect) {
+void WebPluginDelegateImpl::Paint(SkCanvas* canvas, const gfx::Rect& rect) {
   if (!windowless_ || !skia::SupportsPlatformPaint(canvas))
     return;
   skia::ScopedPlatformPaint scoped_platform_paint(canvas);