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Revert "Make F12 close an undocked DevTools window rather than open another DevTools window for this one."
We decided to revert the change, since it breaks user experience a lot of clients are used to.

This reverts commit 30f6403d.

BUG=139581
TBR=pfeldman@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10825217

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150301 0039d316-1c4b-4281-b951-d872f2087c98