Make dragging off a tab in Safari with a docked Inspector reattach the Inspector.

https://webkit.org/b/115832
rdar://problem/13605661

Reviewed by Benjamin Poulain.

* UIProcess/mac/WebInspectorProxyMac.mm:
(WebKit::WebInspectorProxy::platformBringToFront):
If the Web Inspector is no longer in the same window as the inspected view,
then we need to reopen the Inspector to get it attached to the right window.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149804 268f45cc-cd09-0410-ab3c-d52691b4dbfc