Fix Views Combobox and TreeView input minimally.

Fix Views Combobox and TreeView input minimally.

Fixes r216992's regression (input not sent to Combobox/TreeView).
Call views::InputMethod::On[Focus|Blur] for Combobox and TreeView.
This correctly forwards input method input to the focused views.
(this minimal CL should be mergeable to fix this issue in M-30)

I had landed a fix that was more complex: http://crrev.com/219673
That caused regressions and was reverted: http://crrev.com/220121
Both CLs should be superceded by: http://crrev.com/23583013
(but that CL is a complex WIP proof of concept, not mergeable)

BUG=276720
TEST=Test Win (desktop, Win8 Metro, and Aura builds), CrOS, and Linux Aura's Omnibox, Find Bar, Bookmark Bubble, and Edit Bookmark Dialog's textfield text entry (and text input handling to select combobox and tree view elements) with EN, JA, and other IMEs, and related IME usage (Win+Space to change IME on Win8, Alt+` to change modes, etc.). Also test with --enable-text-services-framework.
R=sky@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=221221

[msw, 2013-09-03 22:41:31]

Hey Scott, please take a look; thanks!

[sky, 2013-09-04 00:05:29]

LGTM

[commit-bot: I haz the power, 2013-09-04 00:10:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/msw@chromium.org/23882003/1

[commit-bot: I haz the power, 2013-09-04 17:28:07]

Change committed as 221221