Revert of printing::Metafile: Simplify OS_MACOSX-specific code path

printing/pdf_metafile_skia.h

Index: printing/pdf_metafile_skia.h
diff --git a/printing/pdf_metafile_skia.h b/printing/pdf_metafile_skia.h
index e27da152ea75ecf783f37eb1dc9e87e18e426324..948e27f45e088f54ad91072040f4865e2f5b2796 100644
--- a/printing/pdf_metafile_skia.h
+++ b/printing/pdf_metafile_skia.h
@@ -57,6 +57,11 @@
   bool Playback(skia::NativeDrawingContext hdc,
                 const RECT* rect) const override;
   bool SafePlayback(skia::NativeDrawingContext hdc) const override;
+#elif defined(OS_MACOSX)
+  bool RenderPage(unsigned int page_number,
+                  skia::NativeDrawingContext context,
+                  const CGRect rect,
+                  const MacRenderPageParams& params) const override;
 #endif
 
   bool SaveTo(base::File* file) const override;