Possible fix for ExtensionFunctionDispatcher::DispatchWithCallbackInternal.

Possible fix for ExtensionFunctionDispatcher::DispatchWithCallbackInternal.

This is a possible fix for crashes observed in this function. The member
variable browser_context_ is possibly invalid because the object may
be freed by function->Run(). To avoid this we move the call to
ProcessManager::Get() to before where function->Run() is called.

BUG=441679
Committed: https://crrev.com/accea33ab9847b38b96bfe50c85b27148e76cde1
Cr-Commit-Position: refs/heads/master@{#308214}

[Reilly Grant (use Gerrit), 2014-12-12 21:52:04]

reillyg@chromium.org changed reviewers:
+ yoz@chromium.org

[Reilly Grant (use Gerrit), 2014-12-12 21:52:05]

Yoyo, please take a look at this minor change.

[Yoyo Zhou, 2014-12-13 00:44:24]

LGTM

[Reilly Grant (use Gerrit), 2014-12-13 00:48:25]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2014-12-13 00:50:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/798103002/1

[commit-bot: I haz the power, 2014-12-13 01:30:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-13 01:31:01]

Patchset 1 (id:??) landed as
https://crrev.com/accea33ab9847b38b96bfe50c85b27148e76cde1
Cr-Commit-Position: refs/heads/master@{#308214}