components: Cleanup class/struct fwd declarations

components/plugins/renderer/webview_plugin.h

Index: components/plugins/renderer/webview_plugin.h
diff --git a/components/plugins/renderer/webview_plugin.h b/components/plugins/renderer/webview_plugin.h
index fdb1cf9cbbeeb6915cffa86b053ed20b3e896ef2..712fc0e8bfd3e866790cf639301d41cafbec7fa3 100644
--- a/components/plugins/renderer/webview_plugin.h
+++ b/components/plugins/renderer/webview_plugin.h
@@ -20,7 +20,6 @@
 #include "third_party/WebKit/public/web/WebViewClient.h"
 
 namespace blink {
-class WebFrameWidget;
 class WebMouseEvent;
 }
 
@@ -29,10 +28,6 @@ class RenderView;
 struct WebPreferences;
 }
 
-namespace gfx {
-class Size;
-}
-
 // This class implements the WebPlugin interface by forwarding drawing and
 // handling input events to a WebView.
 // It can be used as a placeholder for an actual plugin, using HTML for the UI.