ConflictResolver: fix reversed should_success check

Looks like this should be likely fixed too?

BUG=240165
R=tzik@chromium.org

Review URL: https://codereview.chromium.org/100883004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238310 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238310