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Previously, we used a different inactive tab image, but that had the problem
that selected background tabs that were showing the throbber would show the
normal tab image within the throbber bounds. This makes us match how views
renders.

BUG=none
TEST=Have a non-active, selected tab show the throbber. The area behind the throbber should match the rest of the tab.


Review URL: http://codereview.chromium.org/8429012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@108049 0039d316-1c4b-4281-b951-d872f2087c98