PrintPreview: Remove |page_number| from StartPageForVectorCanvas function.

printing/emf_win.h

Index: printing/emf_win.h
diff --git a/printing/emf_win.h b/printing/emf_win.h
index a4584c93166aeb305b11e92e5f10bfcbb243b504..f7e0ed59dce9abe110cd59cae0a2a57680053345 100644
--- a/printing/emf_win.h
+++ b/printing/emf_win.h
@@ -46,8 +46,8 @@ class Emf : public Metafile {
   virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size);
 
   virtual SkDevice* StartPageForVectorCanvas(
-      int page_number, const gfx::Size& page_size,
-      const gfx::Rect& content_area, const float& scale_factor);
+      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_area|, and |scale_factor| are