Remove m_pList conditionals from CPWL_ListBox

Remove m_pList conditionals from CPWL_ListBox

We create |m_pList| in the constructor and it is never reset during the lifetime
of the class or subclasses. Remove the conditional checks on the existence
of |m_pList|.

Committed: https://pdfium.googlesource.com/pdfium/+/3617751cea45fd636d58f535a662337fcea40c4a

[dsinclair, 2016-07-19 13:28:46]

dsinclair@chromium.org changed reviewers:
+ thestig@chromium.org, weili@chromium.org

[dsinclair, 2016-07-19 13:28:46]

PTAL.

[Lei Zhang, 2016-07-19 17:12:53]

lgtm

[dsinclair, 2016-07-19 17:15:50]

The CQ bit was checked by dsinclair@chromium.org

[commit-bot: I haz the power, 2016-07-19 17:15:58]

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, 2016-07-19 17:16:13]

Description was changed from

==========
Remove m_pList conditionals from CPWL_ListBox

We create |m_pList| in the constructor and it is never reset during the lifetime
of the class or subclasses. Remove the conditional checks on the existence
of |m_pList|.
==========

to

==========
Remove m_pList conditionals from CPWL_ListBox

We create |m_pList| in the constructor and it is never reset during the lifetime
of the class or subclasses. Remove the conditional checks on the existence
of |m_pList|.

Committed:
https://pdfium.googlesource.com/pdfium/+/3617751cea45fd636d58f535a662337fcea4...
==========

[commit-bot: I haz the power, 2016-07-19 17:16:14]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/3617751cea45fd636d58f535a662337fcea4...