Revert of Reset Text Input State for RenderWidgetHostView before RenderWidgetHost Detaches from ...

Revert of Reset Text Input State for RenderWidgetHostView before RenderWidgetHost Detaches from Delegate (patchset #5 id:80001 of https://codereview.chromium.org/1879453002/ )

Reason for revert:
This is needed to revert 
https://codereview.chromium.org/1652483002/. The original CL caused many regressions.

Original issue's description:
> Reset Text Input State for RenderWidgetHostView before RenderWidgetHost Detaches from Delegate
> 
> During the destruction of WebContentsImpl, the RWHs are first detached and then destroyed. If some RWHV
> has an active input field, then it will never get a chance to notify the WebContentsImpl about
> losing being destroyed and the WebContentsImpl will track the wrong text input state. This will
> cause DCHECK in WebContentsImpl::GetTextInputState being triggered, specifically, for an outer WebContents
> which might outlive the WebContents being destroyed.
> 
> BUG=602144, 601570
> 
> Committed: https://crrev.com/5292d041d34d49e8c3e851a0e21504a983e5be57
> Cr-Commit-Position: refs/heads/master@{#387311}

TBR=creis@chromium.org,kenrb@chromium.org,lazyboy@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=602144, 601570

[EhsanK, 2016-04-15 19:18:02]

Created Revert of Reset Text Input State for RenderWidgetHostView before
RenderWidgetHost Detaches from Delegate

[commit-bot: I haz the power, 2016-04-15 19:18:28]

The CQ bit was unchecked by commit-bot@chromium.org

[EhsanK, 2016-04-15 19:19:06]

The CQ bit was unchecked by ekaramad@chromium.org

[EhsanK, 2016-04-15 19:19:19]

The CQ bit was checked by ekaramad@chromium.org to run a CQ dry run

[Charlie Reis, 2016-04-15 20:52:09]

Should this one be closed in favor of
https://codereview.chromium.org/1889313002/?  (I see it's doing a CQ dry run,
hopefully not about to land.)

[commit-bot: I haz the power, 2016-04-15 21:01:32]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1887303004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1887303004/1

[commit-bot: I haz the power, 2016-04-15 21:31:01]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-04-15 21:31:01]

Dry run: This issue passed the CQ dry run.

[EhsanK, 2016-04-22 19:13:33]

On 2016/04/15 21:31:01, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

Closing in favor of https://codereview.chromium.org/1889313002/ which has
already landed.