Initialize |selection_popup_controller_| properly

Initialize |selection_popup_controller_| properly

Set the class var to nullptr in the constructor. Missing initialization
is suspected to cause crash.

BUG=715826
Review-Url: https://codereview.chromium.org/2842373002
Cr-Commit-Position: refs/heads/master@{#467618}
Committed: https://chromium.googlesource.com/chromium/src/+/68db6d36ffd81d907994065b71905d44875b3cc9

[Jinsuk Kim, 2017-04-26 23:43:47]

jinsukkim@chromium.org changed reviewers:
+ boliu@chromium.org

[boliu, 2017-04-26 23:46:12]

lgtm

[Jinsuk Kim, 2017-04-27 07:07:55]

The CQ bit was checked by jinsukkim@chromium.org

[commit-bot: I haz the power, 2017-04-27 07:08:07]

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, 2017-04-27 07:33:28]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493276875260410, "parent_rev":
"8c5be5dd012c0fd37a655748e561e5f8f92b6112", "commit_rev":
"68db6d36ffd81d907994065b71905d44875b3cc9"}

[commit-bot: I haz the power, 2017-04-27 07:33:40]

Description was changed from

==========
Initialize |selection_popup_controller_| properly

Set the class var to nullptr in the constructor. Missing initialization
is suspected to cause crash.

BUG=715826
==========

to

==========
Initialize |selection_popup_controller_| properly

Set the class var to nullptr in the constructor. Missing initialization
is suspected to cause crash.

BUG=715826

Review-Url: https://codereview.chromium.org/2842373002
Cr-Commit-Position: refs/heads/master@{#467618}
Committed:
https://chromium.googlesource.com/chromium/src/+/68db6d36ffd81d907994065b7190...
==========

[commit-bot: I haz the power, 2017-04-27 07:33:42]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/68db6d36ffd81d907994065b7190...