WebUI: Stop keypresses on the close icon from firing the Enter handler.

WebUI: Stop keypresses on the close icon from firing the Enter handler.

Previously, Enter keypresses on the close icon could trigger the
whole dialog's default Enter handler.

This CL prevents that.

BUG=719387
TEST=MANUAL
R=dpapad@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2884113002
Cr-Original-Commit-Position: refs/heads/master@{#472159}
Review-Url: https://codereview.chromium.org/2891993002 .
Cr-Commit-Position: refs/branch-heads/3071@{#617}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/acd447c3e9f8477a25a76054f7b940728da30107

[tommycli, 2017-05-18 17:40:26]

Description was changed from

==========
WebUI: Stop keypresses on the close icon from firing the Enter handler.

Previously, Enter keypresses on the close icon could trigger the
whole dialog's default Enter handler.

This CL prevents that.

BUG=719387
TEST=MANUAL
R=dpapad@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2884113002
Cr-Commit-Position: refs/heads/master@{#472159}
(cherry picked from commit d760627f0528f7ac3969c4109ba33abb2265b5c3)
==========

to

==========
WebUI: Stop keypresses on the close icon from firing the Enter handler.

Previously, Enter keypresses on the close icon could trigger the
whole dialog's default Enter handler.

This CL prevents that.

BUG=719387
TEST=MANUAL
R=dpapad@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2884113002
Cr-Original-Commit-Position: refs/heads/master@{#472159}
Review-Url: https://codereview.chromium.org/2891993002 .
Cr-Commit-Position: refs/branch-heads/3071@{#617}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/acd447c3e9f8477a25a76054f7b9...
==========

[tommycli, 2017-05-18 17:40:28]

Committed patchset #1 (id:1) manually as
acd447c3e9f8477a25a76054f7b940728da30107.