Fix a typo, that could cause a crash on mac.
Fix a typo, that could cause a crash on mac.

BUG=50717
TBR=rvargas
TEST=Set system proxy settings to use a custom PAC script, then launch TestShell.app -- should not crash.
Review URL: http://codereview.chromium.org/3023030

git-svn-id: http://src.chromium.org/svn/trunk/src@54279 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 1f1e880a7ff7fc1dcb3dbba5910ff6e5a65603c6
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