Merge 2832: Revert of [Editing][CSS] Drag from a -webkit-user-select:none element should not start …

Merge 2832: Revert of [Editing][CSS] Drag from a -webkit-user-select:none element should not start selection (patchset #3 id:80001 of https://codereview.chromium.org/2021793002/ )

Reason for revert:
this is causing hangs on latest canary. crbug.com/638868

Original issue's description:
> [Editing][CSS] Drag from a -webkit-user-select:none element should not start selection
>
> This CL is updated of reverted one:
> https://codereview.chromium.org/2001993002
>
> This CL considers the reverted shadow boundary issue.
>
> BUG=481985
>
> Committed: https://crrev.com/08acdf950e1776571def8e6f16c288769e7e9e27
> Cr-Commit-Position: refs/heads/master@{#412457}

TBR=tkent@chromium.org,yosin@chromium.org,yoichio@chromium.org
BUG=481985, 638868
Review-Url: https://codereview.chromium.org/2256083003
Cr-Commit-Position: refs/heads/master@{#412903}
(cherry picked from commit 29cd7243aa6537f9e1517568a299e8187bb3b230)

Committed: https://chromium.googlesource.com/chromium/src/+/930a07e51ed363faa31a9f54625c86da1ee171e5

[Will Harris, 2016-08-18 19:55:18]

Description was changed from

==========
Merge 2832: Revert of [Editing][CSS] Drag from a -webkit-user-select:none
element should not start selection (patchset #3 id:80001 of
https://codereview.chromium.org/2021793002/ )

Reason for revert:
this is causing hangs on latest canary. crbug.com/638868

Original issue's description:
> [Editing][CSS] Drag from a -webkit-user-select:none element should not start
selection
>
> This CL is updated of reverted one:
> https://codereview.chromium.org/2001993002
>
> This CL considers the reverted shadow boundary issue.
>
> BUG=481985
>
> Committed: https://crrev.com/08acdf950e1776571def8e6f16c288769e7e9e27
> Cr-Commit-Position: refs/heads/master@{#412457}

TBR=tkent@chromium.org,yosin@chromium.org,yoichio@chromium.org
BUG=481985,638868

Review-Url: https://codereview.chromium.org/2256083003
Cr-Commit-Position: refs/heads/master@{#412903}
(cherry picked from commit 29cd7243aa6537f9e1517568a299e8187bb3b230)
==========

to

==========
Merge 2832: Revert of [Editing][CSS] Drag from a -webkit-user-select:none
element should not start selection (patchset #3 id:80001 of
https://codereview.chromium.org/2021793002/ )

Reason for revert:
this is causing hangs on latest canary. crbug.com/638868

Original issue's description:
> [Editing][CSS] Drag from a -webkit-user-select:none element should not start
selection
>
> This CL is updated of reverted one:
> https://codereview.chromium.org/2001993002
>
> This CL considers the reverted shadow boundary issue.
>
> BUG=481985
>
> Committed: https://crrev.com/08acdf950e1776571def8e6f16c288769e7e9e27
> Cr-Commit-Position: refs/heads/master@{#412457}

TBR=tkent@chromium.org,yosin@chromium.org,yoichio@chromium.org
BUG=481985,638868

Review-Url: https://codereview.chromium.org/2256083003
Cr-Commit-Position: refs/heads/master@{#412903}
(cherry picked from commit 29cd7243aa6537f9e1517568a299e8187bb3b230)

Committed:
https://chromium.googlesource.com/chromium/src/+/930a07e51ed363faa31a9f54625c...
==========

[Will Harris, 2016-08-18 19:55:23]

Committed patchset #1 (id:1) manually as
930a07e51ed363faa31a9f54625c86da1ee171e5.