Adding active maintainer to the owners.

Adding active maintainer to the owners.

Adding komatsu@ as the owner of Chrome OS IME.
komatsu@ is leading Japanese IME team and current
 active maintainer of Chrome OS IME.

Adding yukawa@ as the owner of Windows Aura IME.
yukawa@ is the original author of Windows Aura IME
and current active maintainer.

Adding yukishiino@ as the owner of Linux Aura IME.
yukishiino@ is the original author of Linux Aura
IME and current active maintainer.

BUG=None
TEST=None
NOTRY=True

Review URL: https://codereview.chromium.org/64423003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233842 0039d316-1c4b-4281-b951-d872f2087c98