Fix print preview clipping issues due to scaling.

printing/emf_win.h

Index: printing/emf_win.h
===================================================================
--- printing/emf_win.h	(revision 83537)
+++ printing/emf_win.h	(working copy)
@@ -46,14 +46,14 @@
   virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size);
 
   virtual skia::PlatformDevice* StartPageForVectorCanvas(
-      const gfx::Size& page_size, const gfx::Point& content_origin,
+      const gfx::Size& page_size, const gfx::Rect& content_area,
       const float& scale_factor);
   // Inserts a custom GDICOMMENT records indicating StartPage/EndPage calls
   // (since StartPage and EndPage do not work in a metafile DC). Only valid
   // when hdc_ is non-NULL. |page_size|, |content_origin|, and |scale_factor|
   // are ignored.
   virtual bool StartPage(const gfx::Size& page_size,
-                         const gfx::Point& content_origin,
+                         const gfx::Rect& content_area,
                          const float& scale_factor);
   virtual bool FinishPage();
   virtual bool FinishDocument();