PrintPreview: Remove |page_number| from StartPageForVectorCanvas function.

printing/pdf_metafile_cg_mac.cc

Index: printing/pdf_metafile_cg_mac.cc
diff --git a/printing/pdf_metafile_cg_mac.cc b/printing/pdf_metafile_cg_mac.cc
index 07222319cfd1053affd09f36b6317e8cec8b3dca..1cf7f7bcbb1da82e7713283b214bfbf71cd6ccdb 100644
--- a/printing/pdf_metafile_cg_mac.cc
+++ b/printing/pdf_metafile_cg_mac.cc
@@ -107,7 +107,7 @@ bool PdfMetafileCg::InitFromData(const void* src_buffer,
 }
 
 SkDevice* PdfMetafileCg::StartPageForVectorCanvas(
-    int page_number, const gfx::Size& page_size, const gfx::Rect& content_area,
+    const gfx::Size& page_size, const gfx::Rect& content_area,
     const float& scale_factor) {
   NOTIMPLEMENTED();
   return NULL;