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As part of this I made sure the definitions and declarations matched
up. This resulted in reordering a couple of things. In addition the
only other non-move I did was moving what was CreateLayoutManagers()
into InitLayoutManagers() and CloseChildWindowsImpl() into
CloseChildWindows().

BUG=671246
TEST=none
R=jamescook@chromium.org

Review-Url: https://codereview.chromium.org/2628973002
Cr-Commit-Position: refs/heads/master@{#443109}