Plugins: Fix crash in PepperPluginInstanceImpl when render frame gone

Plugins: Fix crash in PepperPluginInstanceImpl when render frame gone

Adds a bunch of missing nullchecks.

Not sure why crash frequency has increased recently. Perhaps changes in
RenderFrameObserver lifecycle:
https://codereview.chromium.org/2034153002

BUG=717886
Review-Url: https://codereview.chromium.org/2860783002
Cr-Commit-Position: refs/heads/master@{#469196}
Committed: https://chromium.googlesource.com/chromium/src/+/6dd584326951d58d927149bec5d677b37cd917b1

[tommycli, 2017-05-03 18:05:27]

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

[commit-bot: I haz the power, 2017-05-03 18:06:08]

Dry run: CQ is trying da patch.

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

[tommycli, 2017-05-03 18:06:14]

tommycli@chromium.org changed reviewers:
+ raymes@chromium.org

[tommycli, 2017-05-03 18:06:15]

raymes: PTAL, feel free to check CQ if it looks good to you. I'll be OOO soon.

[commit-bot: I haz the power, 2017-05-03 19:58:53]

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

[commit-bot: I haz the power, 2017-05-03 19:58:53]

Dry run: This issue passed the CQ dry run.

[raymes, 2017-05-03 23:16:20]

lgtm thanks

[raymes, 2017-05-03 23:16:26]

The CQ bit was checked by raymes@chromium.org

[commit-bot: I haz the power, 2017-05-03 23:17:12]

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, 2017-05-03 23:24:32]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493853386850490, "parent_rev":
"17557d5bf2f8e90c88ca67a92832eae0a09e47f2", "commit_rev":
"6dd584326951d58d927149bec5d677b37cd917b1"}

[commit-bot: I haz the power, 2017-05-03 23:24:39]

Description was changed from

==========
Plugins: Fix crash in PepperPluginInstanceImpl when render frame gone

Adds a bunch of missing nullchecks.

Not sure why crash frequency has increased recently. Perhaps changes in
RenderFrameObserver lifecycle:
https://codereview.chromium.org/2034153002

BUG=717886
==========

to

==========
Plugins: Fix crash in PepperPluginInstanceImpl when render frame gone

Adds a bunch of missing nullchecks.

Not sure why crash frequency has increased recently. Perhaps changes in
RenderFrameObserver lifecycle:
https://codereview.chromium.org/2034153002

BUG=717886

Review-Url: https://codereview.chromium.org/2860783002
Cr-Commit-Position: refs/heads/master@{#469196}
Committed:
https://chromium.googlesource.com/chromium/src/+/6dd584326951d58d927149bec5d6...
==========

[commit-bot: I haz the power, 2017-05-03 23:24:40]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/6dd584326951d58d927149bec5d6...