printing: Use skia::RefPtr to replace manual ref-counting.

[email protected]
BUG=163454
Depends on: https://codereview.chromium.org/11428099/
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/11316263

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170878 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed