GitLab

OptionsPage.showTab could be called with wrong 'this' so remember activeNavTab in parent tab bar instead.

BUG=chromium-os:18662
TEST=Verify fix for chromium-os:18662.

Review URL: http://codereview.chromium.org/7572047

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95689 0039d316-1c4b-4281-b951-d872f2087c98