Revert of Hook up views/widgets to AshDevToolsDOMAgent

Revert of Hook up views/widgets to AshDevToolsDOMAgent (patchset #3 id:40001 of https://codereview.chromium.org/2529553002/ )

Reason for revert:
Reverting due to a memory leak. See http://crbug.com/648701#c26

Original issue's description:
> Hook up views/widgets to AshDevToolsDOMAgent
>
> - This CL adds AshDevToolsDOMAgent as an observer to all widgets and views.
> The WidgetRemovalObserver is specifically to remove the RootView subtree,
> while the ViewObserver is to update any other descendant views.
> AddViewTree was created so that whenever any |view| is added, it can
> be pushed to the frontend.
> - Add tests for when views are inserted, removed, rearranged,
> removed & inserted.
> - Add test to check if a widget owned by a native widget is represented
> properly in the DOM.
>
> BUG=648701
>
> Committed: https://crrev.com/b4ce166c6eb7bf65dedbdb6947e23fbf2992e251
> Cr-Commit-Position: refs/heads/master@{#434863}

TBR=sadrul@chromium.org,mhashmi@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=648701
Committed: https://crrev.com/f640d3cbd00447abe17877078f14c73ad6aca26d
Cr-Commit-Position: refs/heads/master@{#434941}

[battre, 2016-11-29 09:44:14]

The CQ bit was checked by battre@chromium.org

[battre, 2016-11-29 09:44:15]

Created Revert of Hook up views/widgets to AshDevToolsDOMAgent

[commit-bot: I haz the power, 2016-11-29 09:44:47]

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, 2016-11-29 09:45:21]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480412654761500, "parent_rev":
"c1033db58bb0096ad9c0a99555340596bc1e562f", "commit_rev":
"6f4daf85297605c761f8450ee4b7654bb4152e35"}

[commit-bot: I haz the power, 2016-11-29 09:45:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-29 09:47:55]

Description was changed from

==========
Revert of Hook up views/widgets to AshDevToolsDOMAgent (patchset #3 id:40001 of
https://codereview.chromium.org/2529553002/ )

Reason for revert:
Reverting due to a memory leak. See http://crbug.com/648701#c26

Original issue's description:
> Hook up views/widgets to AshDevToolsDOMAgent
> 
> - This CL adds AshDevToolsDOMAgent as an observer to all widgets and views.
> The WidgetRemovalObserver is specifically to remove the RootView subtree,
> while the ViewObserver is to update any other descendant views.
> AddViewTree was created so that whenever any |view| is added, it can
> be pushed to the frontend.
> - Add tests for when views are inserted, removed, rearranged,
> removed & inserted.
> - Add test to check if a widget owned by a native widget is represented
> properly in the DOM.
> 
> BUG=648701
> 
> Committed: https://crrev.com/b4ce166c6eb7bf65dedbdb6947e23fbf2992e251
> Cr-Commit-Position: refs/heads/master@{#434863}

TBR=sadrul@chromium.org,mhashmi@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=648701
==========

to

==========
Revert of Hook up views/widgets to AshDevToolsDOMAgent (patchset #3 id:40001 of
https://codereview.chromium.org/2529553002/ )

Reason for revert:
Reverting due to a memory leak. See http://crbug.com/648701#c26

Original issue's description:
> Hook up views/widgets to AshDevToolsDOMAgent
>
> - This CL adds AshDevToolsDOMAgent as an observer to all widgets and views.
> The WidgetRemovalObserver is specifically to remove the RootView subtree,
> while the ViewObserver is to update any other descendant views.
> AddViewTree was created so that whenever any |view| is added, it can
> be pushed to the frontend.
> - Add tests for when views are inserted, removed, rearranged,
> removed & inserted.
> - Add test to check if a widget owned by a native widget is represented
> properly in the DOM.
>
> BUG=648701
>
> Committed: https://crrev.com/b4ce166c6eb7bf65dedbdb6947e23fbf2992e251
> Cr-Commit-Position: refs/heads/master@{#434863}

TBR=sadrul@chromium.org,mhashmi@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=648701

Committed: https://crrev.com/f640d3cbd00447abe17877078f14c73ad6aca26d
Cr-Commit-Position: refs/heads/master@{#434941}
==========

[commit-bot: I haz the power, 2016-11-29 09:47:56]

Patchset 1 (id:??) landed as
https://crrev.com/f640d3cbd00447abe17877078f14c73ad6aca26d
Cr-Commit-Position: refs/heads/master@{#434941}