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New PanelBrowserWindow class contains the BrowserWindow interface used by the browser to interact with Panels. Panel is now a BaseWindow.

First step of many in the Panel refactor.

BUG=127323
TEST=All existing tests still pass.

Review URL: https://chromiumcodereview.appspot.com/10411036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138310 0039d316-1c4b-4281-b951-d872f2087c98