Make click targets inside links work.

Make click targets inside links work.

There are pages that attach click handlers to elements that are found inside links, and screen readers might try to click such elements. Our existing doDefaultAction logic wasn't handling this possibility.
For example, there might be a graphic inside a link and the screen reader might invoke the default action on the graphic.
BUG=615904
TBR=dmazzoni@chromium.org

Committed: https://crrev.com/b474d37feaa57c430c28477b5aab38f65ff4d9c0
Cr-Commit-Position: refs/heads/master@{#397882}

[nektarios, 2016-06-03 23:08:09]

The CQ bit was checked by nektar@chromium.org

[commit-bot: I haz the power, 2016-06-03 23:08:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2043433002/1

[commit-bot: I haz the power, 2016-06-04 01:25:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-04 01:28:26]

Description was changed from

==========
Make click targets inside links work.

There are pages that attach click handlers to elements that are found inside
links, and screen readers might try to click such elements. Our existing
doDefaultAction logic wasn't handling this possibility.
For example, there might be a graphic inside a link and the screen reader might
invoke the default action on the graphic.
BUG=615904
TBR=dmazzoni@chromium.org
==========

to

==========
Make click targets inside links work.

There are pages that attach click handlers to elements that are found inside
links, and screen readers might try to click such elements. Our existing
doDefaultAction logic wasn't handling this possibility.
For example, there might be a graphic inside a link and the screen reader might
invoke the default action on the graphic.
BUG=615904
TBR=dmazzoni@chromium.org

Committed: https://crrev.com/b474d37feaa57c430c28477b5aab38f65ff4d9c0
Cr-Commit-Position: refs/heads/master@{#397882}
==========

[commit-bot: I haz the power, 2016-06-04 01:28:27]

Patchset 1 (id:??) landed as
https://crrev.com/b474d37feaa57c430c28477b5aab38f65ff4d9c0
Cr-Commit-Position: refs/heads/master@{#397882}