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Move the interfaces FocusChangeListener and InputMethodDelegate from
being implemented by BridgedNativeWidget to being implemented in
BridgedNativeWidgetHostImpl. This has the effect of moving them from
the app shim process to the browser process.

This is in preparaton for removing access to TextInputClient from
BridgedContentView (that operation is delicate). Add a temporary
method on BridgedNativeWidget to set the TextInputClient for
BridgedContentView from BridgedNativeWidgetHostImpl (where we now
receive the OnDidChangeFocus notification).

Bug: 859152
Change-Id: I1f5639448cc9f7b4b00058444ab64914b9193df3
Reviewed-on: https://chromium-review.googlesource.com/1170582Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582238}