GitLab

1) Makes InputMethodEngine extension based instead of input component based.
2) Makes InputMethodEngine independent to user profile.
3) Makes InputMethodEventRouter independent to user profile, except
   forwarding events to extension.

BUG=342336
TEST=Verified on sandbox.

Review URL: https://codereview.chromium.org/433163005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287781 0039d316-1c4b-4281-b951-d872f2087c98