Merge to M51: Don't send focus accessibility events when tab isn't focused.

Merge to M51: Don't send focus accessibility events when tab isn't focused.

This regressed in r383885 (https://codereview.chromium.org/1815933002).
I meant to check if the focus callback was null, but instead I was
checking if the lazy instance pointer to the callback was null, which
is never true.

BUG=608033
Review-Url: https://codereview.chromium.org/1932383002
Cr-Commit-Position: refs/heads/master@{#390772}
(cherry picked from commit e7d3cad741a52f6d40bc14b211c9fe372f57481d)

Committed: https://chromium.googlesource.com/chromium/src/+/daae3dc469b408b754e019bf49513494790cfc33

[dmazzoni, 2016-05-02 17:37:35]

Description was changed from

==========
Merge to M51: Don't send focus accessibility events when tab isn't focused.

This regressed in r383885 (https://codereview.chromium.org/1815933002).
I meant to check if the focus callback was null, but instead I was
checking if the lazy instance pointer to the callback was null, which
is never true.

BUG=608033

Review-Url: https://codereview.chromium.org/1932383002
Cr-Commit-Position: refs/heads/master@{#390772}
(cherry picked from commit e7d3cad741a52f6d40bc14b211c9fe372f57481d)
==========

to

==========
Merge to M51: Don't send focus accessibility events when tab isn't focused.

This regressed in r383885 (https://codereview.chromium.org/1815933002).
I meant to check if the focus callback was null, but instead I was
checking if the lazy instance pointer to the callback was null, which
is never true.

BUG=608033

Review-Url: https://codereview.chromium.org/1932383002
Cr-Commit-Position: refs/heads/master@{#390772}
(cherry picked from commit e7d3cad741a52f6d40bc14b211c9fe372f57481d)

Committed:
https://chromium.googlesource.com/chromium/src/+/daae3dc469b408b754e019bf4951...
==========

[dmazzoni, 2016-05-02 17:37:37]

Committed patchset #1 (id:1) manually as
daae3dc469b408b754e019bf49513494790cfc33.