memory coordinator: Check RenderProcessHost pointers before use them

memory coordinator: Check RenderProcessHost pointers before use them

RenderProcessHost::FromID() could return nullptrs. We should check it
before using it.

BUG=668924
Committed: https://crrev.com/1c34e42ac01d4698bacf17b785f24fb2b965e7ab
Cr-Commit-Position: refs/heads/master@{#434611}

[bashi, 2016-11-28 03:24:20]

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

[commit-bot: I haz the power, 2016-11-28 03:24:31]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[bashi, 2016-11-28 03:24:32]

bashi@chromium.org changed reviewers:
+ haraken@chromium.org

[bashi, 2016-11-28 03:24:33]

PTAL

[haraken, 2016-11-28 04:10:55]

LGTM

[bashi, 2016-11-28 04:40:09]

The CQ bit was unchecked by bashi@chromium.org

[bashi, 2016-11-28 04:40:11]

The CQ bit was checked by bashi@chromium.org

[commit-bot: I haz the power, 2016-11-28 04:40:21]

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, 2016-11-28 06:04:34]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480308011421920, "parent_rev":
"6f990b0414cd7085ddd5e11a017bb6b15bde48d6", "commit_rev":
"7605223b569f79dd1acb89553927bb4c6e0f6589"}

[commit-bot: I haz the power, 2016-11-28 06:04:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-28 06:07:44]

Description was changed from

==========
memory coordinator: Check RenderProcessHost pointers before use them

RenderProcessHost::FromID() could return nullptrs. We should check it
before using it.

BUG=668924
==========

to

==========
memory coordinator: Check RenderProcessHost pointers before use them

RenderProcessHost::FromID() could return nullptrs. We should check it
before using it.

BUG=668924

Committed: https://crrev.com/1c34e42ac01d4698bacf17b785f24fb2b965e7ab
Cr-Commit-Position: refs/heads/master@{#434611}
==========

[commit-bot: I haz the power, 2016-11-28 06:07:45]

Patchset 1 (id:??) landed as
https://crrev.com/1c34e42ac01d4698bacf17b785f24fb2b965e7ab
Cr-Commit-Position: refs/heads/master@{#434611}