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We don't need to support following event callbacks in production.
- InputMethodObserver::OnCaretBoundsChanged
- InputMethodObserver::OnInputLocaleChanged
- InputMethodObserver::OnFocus
- InputMethodObserver::OnBlur
- InputMethodObserver::OnTextInputTypeChanged

This CL get rid of them from ui::InputMethodBase and its subclassed and ui::RemoteInputMethodWin.  These code were unnecessarily added by r231563 and 236449.

BUG=322038
TEST=covered by unittests

Review URL: https://codereview.chromium.org/81023002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237063 0039d316-1c4b-4281-b951-d872f2087c98