Avoid leaking hash_object_ in SignatureCreator on Windows.
Avoid leaking hash_object_ in SignatureCreator on Windows.

TEST=valgrind wine base_unittests SIgnatureCreatorTest.*
BUG=none
Review URL: http://codereview.chromium.org/391040

git-svn-id: http://src.chromium.org/svn/trunk/src@31946 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 02eb60dadbe07e636b40f40e6b6fafc6e104dc1c
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser