Revert of Migrate IME state update flow

Revert of Migrate IME state update flow (patchset #4 id:100001 of https://codereview.chromium.org/2777223004/ )

Reason for revert:
This patchset caused a regression crbug.com/709349: 'cut' option disappeared from webview selection pop up.

Original issue's description:
> Migrate IME state update flow
>     
> Refactored the flow for IME state update so it bypasses CVCImpl
> and go straight from RWHVA -> ImeAdapter native -> Java layer.
> 
> Other related changes are:
> 
> ImeAdapter provides EventObserver to reduce the dependency on CVC,
> based on the suggestion made in https://goo.gl/pdtQCl. It is used
> by an embedder (Chrome) and CVC to deal with IME notification.
> This replaces IME state update done through CVC. Only the necessary
> info (node editability, password attribute) are passed.
> 
> ImeAdapter.ImeAdapterDelegate is to delegate some work upon IME
> events. But it is used by ContentViewCore only, and there is no
> clear benefit of having the interface. It was removed for
> simplification. All the stuff can be (and are now) handled inside
> ImeAdapter.
> 
> BUG=662908, 626765, 620172
> 
> Review-Url: https://codereview.chromium.org/2777223004
> Cr-Commit-Position: refs/heads/master@{#462419}
> Committed: https://chromium.googlesource.com/chromium/src/+/cc9e77e7d9e05da0f6017f1bdea024f0ce669786

TBR=boliu@chromium.org,tedchoc@chromium.org,jinsukkim@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=662908, 626765, 620172
Review-Url: https://codereview.chromium.org/2803203003
Cr-Commit-Position: refs/heads/master@{#463053}
Committed: https://chromium.googlesource.com/chromium/src/+/ee89226f5c1820a579f50147cbfaf7df9462a0a2

[Changwan Ryu, 2017-04-07 22:30:19]

The CQ bit was checked by changwan@chromium.org

[Changwan Ryu, 2017-04-07 22:30:19]

Created Revert of Migrate IME state update flow

[commit-bot: I haz the power, 2017-04-07 22:30:55]

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, 2017-04-07 23:42:47]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1491604219087470, "parent_rev":
"e3e4a4e437e837f6696861741dcde15693529b50", "commit_rev":
"ee89226f5c1820a579f50147cbfaf7df9462a0a2"}

[commit-bot: I haz the power, 2017-04-07 23:43:33]

Description was changed from

==========
Revert of Migrate IME state update flow (patchset #4 id:100001 of
https://codereview.chromium.org/2777223004/ )

Reason for revert:
This patchset caused a regression crbug.com/709349: 'cut' option disappeared
from webview selection pop up.

Original issue's description:
> Migrate IME state update flow
>     
> Refactored the flow for IME state update so it bypasses CVCImpl
> and go straight from RWHVA -> ImeAdapter native -> Java layer.
> 
> Other related changes are:
> 
> ImeAdapter provides EventObserver to reduce the dependency on CVC,
> based on the suggestion made in https://goo.gl/pdtQCl. It is used
> by an embedder (Chrome) and CVC to deal with IME notification.
> This replaces IME state update done through CVC. Only the necessary
> info (node editability, password attribute) are passed.
> 
> ImeAdapter.ImeAdapterDelegate is to delegate some work upon IME
> events. But it is used by ContentViewCore only, and there is no
> clear benefit of having the interface. It was removed for
> simplification. All the stuff can be (and are now) handled inside
> ImeAdapter.
> 
> BUG=662908,626765,620172
> 
> Review-Url: https://codereview.chromium.org/2777223004
> Cr-Commit-Position: refs/heads/master@{#462419}
> Committed:
https://chromium.googlesource.com/chromium/src/+/cc9e77e7d9e05da0f6017f1bdea0...

TBR=boliu@chromium.org,tedchoc@chromium.org,jinsukkim@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=662908,626765,620172
==========

to

==========
Revert of Migrate IME state update flow (patchset #4 id:100001 of
https://codereview.chromium.org/2777223004/ )

Reason for revert:
This patchset caused a regression crbug.com/709349: 'cut' option disappeared
from webview selection pop up.

Original issue's description:
> Migrate IME state update flow
>     
> Refactored the flow for IME state update so it bypasses CVCImpl
> and go straight from RWHVA -> ImeAdapter native -> Java layer.
> 
> Other related changes are:
> 
> ImeAdapter provides EventObserver to reduce the dependency on CVC,
> based on the suggestion made in https://goo.gl/pdtQCl. It is used
> by an embedder (Chrome) and CVC to deal with IME notification.
> This replaces IME state update done through CVC. Only the necessary
> info (node editability, password attribute) are passed.
> 
> ImeAdapter.ImeAdapterDelegate is to delegate some work upon IME
> events. But it is used by ContentViewCore only, and there is no
> clear benefit of having the interface. It was removed for
> simplification. All the stuff can be (and are now) handled inside
> ImeAdapter.
> 
> BUG=662908,626765,620172
> 
> Review-Url: https://codereview.chromium.org/2777223004
> Cr-Commit-Position: refs/heads/master@{#462419}
> Committed:
https://chromium.googlesource.com/chromium/src/+/cc9e77e7d9e05da0f6017f1bdea0...

TBR=boliu@chromium.org,tedchoc@chromium.org,jinsukkim@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=662908,626765,620172

Review-Url: https://codereview.chromium.org/2803203003
Cr-Commit-Position: refs/heads/master@{#463053}
Committed:
https://chromium.googlesource.com/chromium/src/+/ee89226f5c1820a579f50147cbfa...
==========

[commit-bot: I haz the power, 2017-04-07 23:43:34]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/ee89226f5c1820a579f50147cbfa...