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Add NativeWidgetViews. This is a stub implementation that mostly just defers to its parent NativeWidget.

http://crbug.com/83663
TEST=none
Review URL: http://codereview.chromium.org/6990048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86488 0039d316-1c4b-4281-b951-d872f2087c98