enabled one browser test and tag JavascriptAlertActivatesTab, ReloadThenCancelBeforeUnload, & SingleBeforeUnloadAfterWindowClose as disabled so they compile but don't run on the Mac
enabled one browser test and tag JavascriptAlertActivatesTab, ReloadThenCancelBeforeUnload, & SingleBeforeUnloadAfterWindowClose as disabled so they compile but don't run on the Mac

TEST=tree stays green
BUG=29424
Review URL: http://codereview.chromium.org/464039

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@33850 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser