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We want to build Chrome with toolkit-views available, but port things
gradually.

This change converts a View* argument into a callback argument that
calls the required member function on View.

This lets us get rid of eleven #ifdef guards which would otherwise need
to change (now, and again once the download shelf is ported to use views
on Mac).

BUG=390755

Review URL: https://codereview.chromium.org/377223002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283330 0039d316-1c4b-4281-b951-d872f2087c98