Revert of Use Window coordinates for IME composition bounds, auto resize (patchset #5 id:200001 of https://codereview.chromium.org/1496243005/ )

Reason for revert:
Fails on http://build.chromium.org/p/chromium.mac/builders/Mac10.10%20Tests/builds/4247.

Original issue's description:
> Use Window coordinates for IME composition bounds, auto resize, pepper's selection bounds.
>
> BUG=485650
> TEST=covered by unit tests.
>
> Committed: https://crrev.com/3d09c3fa33ff2d2a8fd85c9cc71f0faf1f3fbe05
> Cr-Commit-Position: refs/heads/master@{#364911}

TBR=bokan@chromium.org,avi@chromium.org,oshima@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=485650

Review URL: https://codereview.chromium.org/1521853002

Cr-Commit-Position: refs/heads/master@{#364949}
4 files changed