Revert 248146 "Revert 248142 "Enable the Translate bubble UX by ..."

> Revert 248142 "Enable the Translate bubble UX by default"
> 
> > Enable the Translate bubble UX by default
> > 
> > Remove the flag --enable-translate-new-ux and enable the bubble by default only for the aura environments.
> > 
> > BUG=276181
> > TEST=browser_tests --gtest_filter=TransalteManagerBrowserTest.*:TranslateBubbleViewBrowserTest.*:TranslateBrowserTest.*
> > 
> > Review URL: https://codereview.chromium.org/148173003
> 
> TBR=hajimehoshi@chromium.org
> 
> Review URL: https://codereview.chromium.org/151243002

TBR=hajimehoshi@chromium.org

Review URL: https://codereview.chromium.org/151293002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248162 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248162