Make chrome_plugin_host.cc and chrome_plugin_util.cc compile on Posix.

chrome/browser/modal_html_dialog_delegate.h

Index: chrome/browser/modal_html_dialog_delegate.h
===================================================================
--- chrome/browser/modal_html_dialog_delegate.h	(revision 10402)
+++ chrome/browser/modal_html_dialog_delegate.h	(working copy)
@@ -7,6 +7,7 @@
 
 #include <vector>
 
+#include "base/gfx/size.h"
 #include "chrome/browser/dom_ui/html_dialog_contents.h"
 #include "chrome/common/notification_observer.h"
 
@@ -31,7 +32,7 @@
   virtual bool IsDialogModal() const;
   virtual std::wstring GetDialogTitle() const { return L"Google Gears"; }
   virtual GURL GetDialogContentURL() const;
-  virtual void GetDialogSize(CSize* size) const;
+  virtual void GetDialogSize(gfx::Size* size) const;
   virtual std::string GetDialogArgs() const;
   virtual void OnDialogClosed(const std::string& json_retval);