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Before this CL, RequestHideIme() was called by Android side just after
the call of OnTextInputTypeChanged().
However, the interval between the call of OnTextInputTypeChanged() and
the call of RequestHideIme() can be larger than the length of the
animation of showing the virtual keyboard.
When it happens, the bounds of the shown virtual keyboard is notified to
Android side by OnKeyboardAppearanceChanged() and it causes confusion.
This CL fixes it by calling HideKeyboardImplicitlyBySystem() in
OnTextInputTypeChanged() and marks RequestHideIme() mojo call as
deprecated because it's not needed anymore.

Bug: b/148483295
Bug: 1023656
Change-Id: I32c46c18949323c0a33a26dd10a18e2e38cc277a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089434Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748518}