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In general View::RequestFocus() and FocusManager::SetFocusedView() do
the same thing. The only exception to that is the SetFocusedView()
does not check if the view wants focus, where as View::RequestFocus()
does. For the cases I'm changing here RequestFocus() is fine.

BUG=none
TEST=none
R=msw@chromium.org

Review-Url: https://codereview.chromium.org/2738063007
Cr-Commit-Position: refs/heads/master@{#456118}