Add skia::RefPtr class to wrap ref counted classes from Skia.

chrome/renderer/print_web_view_helper_linux.cc

Index: chrome/renderer/print_web_view_helper_linux.cc
diff --git a/chrome/renderer/print_web_view_helper_linux.cc b/chrome/renderer/print_web_view_helper_linux.cc
index f1ec86550ee3cea6c5cb5569de31050bae54bb05..ec7af6128e213b46a9094f5f15107586e70cabce 100644
--- a/chrome/renderer/print_web_view_helper_linux.cc
+++ b/chrome/renderer/print_web_view_helper_linux.cc
@@ -194,8 +194,8 @@ void PrintWebViewHelper::PrintPageInternal(
 
   // The printPage method take a reference to the canvas we pass down, so it
   // can't be a stack object.
-  SkRefPtr<skia::VectorCanvas> canvas = new skia::VectorCanvas(device);
-  canvas->unref();  // SkRefPtr and new both took a reference.
+  skia::RefPtr<skia::VectorCanvas> canvas =
+      skia::AdoptRef(new skia::VectorCanvas(device));
   printing::MetafileSkiaWrapper::SetMetafileOnCanvas(*canvas, metafile);
   skia::SetIsDraftMode(*canvas, is_print_ready_metafile_sent_);