Don't include 'Aura' in version string any more

Removed the wrench menu badge, remove this too.

R=cpu@chromium.org
TBR=sky
BUG=313473

Review URL: https://codereview.chromium.org/58833002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233026 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233026