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This cl also removes the unnecessary ModeIndicatorController, because
1) Init widget container can be done directly in ash.
2) ImeControllerClient has already listened to InputMethodChanged event.
3) The anchor bounds can be got via the IMECandidateWindowHandlerInterface.

Bug: 738531
Change-Id: Ieee87fde776be2f33121da52293b886933106205
Reviewed-on: https://chromium-review.googlesource.com/1170717
Commit-Queue: Shu Chen <shuchen@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583164}