Enable untrusted mousedown on select boxes for webview

Enable untrusted mousedown on select boxes for webview

We have found that some webviews are using fastclick inside them and
due to a risk of breakage we are going to allow mousedown on selects
even if they are untrusted.

BUG=642698
Review-Url: https://codereview.chromium.org/2300633007
Cr-Commit-Position: refs/heads/master@{#416330}
(cherry picked from commit 0c254feb3c58b5a9223591084e77d093173d582b)

Committed: https://chromium.googlesource.com/chromium/src/+/12e9fa3d012bcaa1a3aecea1a35c68309e8b8bd9

[dtapuska, 2016-09-02 20:19:27]

Description was changed from

==========
Enable untrusted mousedown on select boxes for webview

We have found that some webviews are using fastclick inside them and
due to a risk of breakage we are going to allow mousedown on selects
even if they are untrusted.

BUG=642698

Review-Url: https://codereview.chromium.org/2300633007
Cr-Commit-Position: refs/heads/master@{#416330}
(cherry picked from commit 0c254feb3c58b5a9223591084e77d093173d582b)
==========

to

==========
Enable untrusted mousedown on select boxes for webview

We have found that some webviews are using fastclick inside them and
due to a risk of breakage we are going to allow mousedown on selects
even if they are untrusted.

BUG=642698

Review-Url: https://codereview.chromium.org/2300633007
Cr-Commit-Position: refs/heads/master@{#416330}
(cherry picked from commit 0c254feb3c58b5a9223591084e77d093173d582b)

Committed:
https://chromium.googlesource.com/chromium/src/+/12e9fa3d012bcaa1a3aecea1a35c...
==========

[dtapuska, 2016-09-02 20:19:28]

Committed patchset #1 (id:1) manually as
12e9fa3d012bcaa1a3aecea1a35c68309e8b8bd9.