Update PlatformCanvas to SKCanvas

chromium_src/chrome/renderer/printing/print_web_view_helper_linux.cc

@@ -123,7 +123,7 @@ void PrintWebViewHelper::PrintPageInternal(
                                           &content_area);
   gfx::Rect canvas_area = content_area;
 
-  skia::PlatformCanvas* canvas = metafile->GetVectorCanvasForNewPage(
+  SkCanvas* canvas = metafile->GetVectorCanvasForNewPage(
       page_size, canvas_area, scale_factor);
   if (!canvas)
     return;

chromium_src/chrome/renderer/printing/print_web_view_helper_pdf_win.cc

@@ -158,7 +158,7 @@ void PrintWebViewHelper::PrintPageInternal(
       frame->getPrintPageShrink(params.page_number);
   float scale_factor = css_scale_factor * webkit_page_shrink_factor;
 
-  skia::PlatformCanvas* canvas = metafile->GetVectorCanvasForNewPage(
+  SkCanvas* canvas = metafile->GetVectorCanvasForNewPage(
       page_size, canvas_area, scale_factor);
   if (!canvas)
     return;