Revert "Place DevTools WebContents underneath inspected WebContents."

This reverts commit bd156acdb0abe5f3e6cfa3b35a1af1a248249158.
See bug for details.

BUG=329580
TBR=dgozman

Review URL: https://codereview.chromium.org/100133003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241608 0039d316-1c4b-4281-b951-d872f2087c98
Add cross account error detection to inline signin

BUG=318859
R=rogerta@chromium.org, xiyuan@chromium.org

Review URL: https://codereview.chromium.org/116543007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241609 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241608
SVN changes up to revision 241609