Fix missing headers in chrome/browser/task_manager/providers/web_contents

Fix missing headers in chrome/browser/task_manager/providers/web_contents

Decreased the number of missing header files by 18.

BUG=661774
Review-Url: https://codereview.chromium.org/2855543002
Cr-Commit-Position: refs/heads/master@{#468499}
Committed: https://chromium.googlesource.com/chromium/src/+/9d04cf08c6f0850dc580ae9416365909768c011a

[wychen, 2017-05-01 05:24:38]

The CQ bit was checked by wychen@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-05-01 05:24:47]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[wychen, 2017-05-01 06:09:01]

wychen@chromium.org changed reviewers:
+ afakhry@chromium.org

[wychen, 2017-05-01 06:09:02]

PTAL

[commit-bot: I haz the power, 2017-05-01 06:57:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-05-01 06:57:36]

Dry run: This issue passed the CQ dry run.

[afakhry, 2017-05-01 23:53:30]

lgtm

[wychen, 2017-05-02 00:02:03]

The CQ bit was checked by wychen@chromium.org

[commit-bot: I haz the power, 2017-05-02 00:03:32]

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, 2017-05-02 00:10:13]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493683323108130, "parent_rev":
"928d141051d4bf9b8ae82a708e914470f5787b54", "commit_rev":
"9d04cf08c6f0850dc580ae9416365909768c011a"}

[commit-bot: I haz the power, 2017-05-02 00:11:05]

Description was changed from

==========
Fix missing headers in chrome/browser/task_manager/providers/web_contents

Decreased the number of missing header files by 18.

BUG=661774
==========

to

==========
Fix missing headers in chrome/browser/task_manager/providers/web_contents

Decreased the number of missing header files by 18.

BUG=661774

Review-Url: https://codereview.chromium.org/2855543002
Cr-Commit-Position: refs/heads/master@{#468499}
Committed:
https://chromium.googlesource.com/chromium/src/+/9d04cf08c6f0850dc580ae941636...
==========

[commit-bot: I haz the power, 2017-05-02 00:11:07]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9d04cf08c6f0850dc580ae941636...