Disable WebView/Chrome's drag and drop feature on M and below.

Disable WebView/Chrome's drag and drop feature on M and below.

We've made a decision that drag and drop will be supported on N+ only.
This CL disables drag and drop on M and below, and makes sure blink is not stuck
in a drag and drop pending state.

BUG=643765
Committed: https://crrev.com/865edaf64571cb9147d49d59d591300b50087234
Cr-Commit-Position: refs/heads/master@{#416376}

[hush (inactive), 2016-09-02 22:01:03]

hush@chromium.org changed reviewers:
+ tedchoc@chromium.org

[hush (inactive), 2016-09-02 22:01:03]

Hello Ted, PTAL

[Ted C, 2016-09-02 22:08:08]

lgtm

[hush (inactive), 2016-09-02 22:11:37]

The CQ bit was checked by hush@chromium.org

[commit-bot: I haz the power, 2016-09-02 22:12:19]

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, 2016-09-02 22:58:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-02 23:01:12]

Description was changed from

==========
Disable WebView/Chrome's drag and drop feature on M and below.

We've made a decision that drag and drop will be supported on N+ only.
This CL disables drag and drop on M and below, and makes sure blink is not stuck
in a drag and drop pending state.

BUG=643765
==========

to

==========
Disable WebView/Chrome's drag and drop feature on M and below.

We've made a decision that drag and drop will be supported on N+ only.
This CL disables drag and drop on M and below, and makes sure blink is not stuck
in a drag and drop pending state.

BUG=643765

Committed: https://crrev.com/865edaf64571cb9147d49d59d591300b50087234
Cr-Commit-Position: refs/heads/master@{#416376}
==========

[commit-bot: I haz the power, 2016-09-02 23:01:13]

Patchset 1 (id:??) landed as
https://crrev.com/865edaf64571cb9147d49d59d591300b50087234
Cr-Commit-Position: refs/heads/master@{#416376}