Revert of Revert "Simplify handling of text input types in RenderWidget."

Revert of Revert "Simplify handling of text input types in RenderWidget." (patchset #1 id:1 of https://codereview.chromium.org/2453503002/ )

Reason for revert:
Bad diff editing on my part.

Original issue's description:
> Revert "Simplify handling of text input types in RenderWidget."
> 
> This reverts commit 03c1f6703465e6a0289c8799455afb62f87071df,
> because it broke IME.
> 
> BUG=653958
> TBR=esprehn
> 
> Review-Url: https://codereview.chromium.org/2442323004
> Cr-Commit-Position: refs/heads/master@{#427396}
> (cherry picked from commit 97b6c2bd1278f651b9b30e22685ede87f761a9ca)
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/cddb25425a67f01e75126631a0e03a6b86b1fa3a

TBR=esprehn@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=653958

[dglazkov, 2016-10-25 19:47:48]

The CQ bit was checked by dglazkov@chromium.org

[dglazkov, 2016-10-25 19:47:49]

Created Revert of Revert "Simplify handling of text input types in
RenderWidget."

[commit-bot: I haz the power, 2016-10-25 19:48:12]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-25 19:50:42]

Committed patchset #1 (id:1)