Reorder MediaRouterUI and MediaRouterUIBase methods

Reorder the methods in .cc files to match the order in .h files.
No functional changes.

Change-Id: Ie798b6ee82d7fbd6913fe58b01bb9a177aba9d12
Reviewed-on: https://chromium-review.googlesource.com/1058603
Reviewed-by: Derek Cheng <imcheng@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559237}
2 files changed