Allow nullptr to be converted to JavaRef subclasses.

Allow nullptr to be converted to JavaRef subclasses.

nullptr can already be converted to JavaRef; also allow it to be
converted to ScopedJavaLocalRef and ScopedJavaGlobalRef, as otherwise
certain constructs (like use of the ternary operator) fail to deduce
types correctly.

BUG=

Committed: https://crrev.com/0fce7cca2e2e93baf56f28c98fe756b7d88a4c79
Cr-Commit-Position: refs/heads/master@{#415808}

[Torne, 2016-08-31 16:50:02]

torne@chromium.org changed reviewers:
+ nyquist@chromium.org

[nyquist, 2016-08-31 22:17:14]

omg lgtm thanksverymuch

[nyquist, 2016-08-31 22:17:18]

The CQ bit was checked by nyquist@chromium.org

[nyquist, 2016-08-31 22:17:33]

I saw you had a dependent patch so I CQed it for you.

[commit-bot: I haz the power, 2016-08-31 22:18:09]

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, 2016-08-31 23:51:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-31 23:53:31]

Description was changed from

==========
Allow nullptr to be converted to JavaRef subclasses.

nullptr can already be converted to JavaRef; also allow it to be
converted to ScopedJavaLocalRef and ScopedJavaGlobalRef, as otherwise
certain constructs (like use of the ternary operator) fail to deduce
types correctly.

BUG=
==========

to

==========
Allow nullptr to be converted to JavaRef subclasses.

nullptr can already be converted to JavaRef; also allow it to be
converted to ScopedJavaLocalRef and ScopedJavaGlobalRef, as otherwise
certain constructs (like use of the ternary operator) fail to deduce
types correctly.

BUG=

Committed: https://crrev.com/0fce7cca2e2e93baf56f28c98fe756b7d88a4c79
Cr-Commit-Position: refs/heads/master@{#415808}
==========

[commit-bot: I haz the power, 2016-08-31 23:53:32]

Patchset 1 (id:??) landed as
https://crrev.com/0fce7cca2e2e93baf56f28c98fe756b7d88a4c79
Cr-Commit-Position: refs/heads/master@{#415808}