fix minor error between kStroke_PathAsRect and kFill_PathAsRect in SkPath::asRect

R=caryclark@google.com, reed@google.com

Author: yunchao.he@intel.com

Review URL: https://codereview.chromium.org/138703008

git-svn-id: http://skia.googlecode.com/svn/trunk@13390 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed