Add a comment why we use HeapVector for a map in EventListenerMap.

Add a comment why we use HeapVector for a map in EventListenerMap.

See wkrev.com/128002
This CL has no behavior changes.

NOTRY=true

Committed: https://crrev.com/647600005a2d72d814b036506cf2a80fec72f4ca
Cr-Commit-Position: refs/heads/master@{#403839}

[tkent, 2016-07-05 23:52:36]

Description was changed from

==========
Add a comment describing why we use HeapVector for a map.

See wkrev.com/128002
This CL has no behavior changes.

NOTRY=true
==========

to

==========
Add a comment why we use HeapVector for a map in EventListenerMap.

See wkrev.com/128002
This CL has no behavior changes.

NOTRY=true
==========

[tkent, 2016-07-06 00:52:26]

tkent@chromium.org changed reviewers:
+ kochi@chromium.org

[tkent, 2016-07-06 00:52:26]

kochi@, would you review this please?

[kochi, 2016-07-06 02:20:28]

The CQ bit was checked by kochi@chromium.org

[kochi, 2016-07-06 02:20:29]

lgtm

[commit-bot: I haz the power, 2016-07-06 02:20:46]

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, 2016-07-06 02:24:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-06 02:27:20]

Description was changed from

==========
Add a comment why we use HeapVector for a map in EventListenerMap.

See wkrev.com/128002
This CL has no behavior changes.

NOTRY=true
==========

to

==========
Add a comment why we use HeapVector for a map in EventListenerMap.

See wkrev.com/128002
This CL has no behavior changes.

NOTRY=true

Committed: https://crrev.com/647600005a2d72d814b036506cf2a80fec72f4ca
Cr-Commit-Position: refs/heads/master@{#403839}
==========

[commit-bot: I haz the power, 2016-07-06 02:27:21]

Patchset 1 (id:??) landed as
https://crrev.com/647600005a2d72d814b036506cf2a80fec72f4ca
Cr-Commit-Position: refs/heads/master@{#403839}