vk: Fix OWNERS files.

- Fix two OWNERS files that pointed to //ui/keyboard instead of
  //ash/keyboard.
- Moved ash/keyboard/ui/OWNERS to ash/keyboard/OWNERS as they just
  pointed to the same thing.
- Added OWNERS to c/b/ui/ash/keyboard that points to ash/keyboard/.

Bug: 961568
No-Presubmit: true
Change-Id: Iebb1d3bde2e3e22a02fb3216d1967a1abb49abb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1638077
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666111}

ash/keyboard/OWNERS

-file://ash/keyboard/ui/OWNERS
+googleo@chromium.org
+shend@chromium.org
+shuchen@chromium.org
+wuyingbing@chromium.org
+yhanada@chromium.org
 
 # COMPONENT: UI>Input>VirtualKeyboard

ash/keyboard/ui/OWNERS

-googleo@chromium.org
-shend@chromium.org
-shuchen@chromium.org
-wuyingbing@chromium.org
-yhanada@chromium.org
-
-# COMPONENT: UI>Input>VirtualKeyboard

chrome/browser/ui/ash/keyboard/OWNERS

+file://ash/keyboard/OWNERS
+
+# COMPONENT: UI>Input>VirtualKeyboard

extensions/browser/api/virtual_keyboard/OWNERS

 tbarzic@chromium.org
-file://ui/keyboard/OWNERS
+file://ash/keyboard/OWNERS
 
 # COMPONENT: UI>Input>VirtualKeyboard

extensions/browser/api/virtual_keyboard_private/OWNERS

-file://ui/keyboard/OWNERS
+file://ash/keyboard/OWNERS
 
 # COMPONENT: UI>Input>VirtualKeyboard