Revert of clean up printing::Image and printing::Metafile

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 f6a53f5552cfe8716bf826df123d09b88aacde53..898e795010052ebe85a5d8bc7bfde2fb6024fe09 100644
--- a/printing/pdf_metafile_cg_mac.cc
+++ b/printing/pdf_metafile_cg_mac.cc
@@ -174,15 +174,7 @@
     LOG(ERROR) << "Unable to initialize PDF document from data";
     return false;
   }
-  return metafile.OnRenderPage(page_number, context, rect, params);
-}
-
-bool PdfMetafileCg::OnRenderPage(
-    unsigned int page_number,
-    CGContextRef context,
-    const CGRect rect,
-    const PdfMetafileCg::RenderPageParams& params) {
-  CGPDFDocumentRef pdf_doc = GetPDFDocument();
+  CGPDFDocumentRef pdf_doc = metafile.GetPDFDocument();
   if (!pdf_doc) {
     LOG(ERROR) << "Unable to create PDF document from data";
     return false;