Update error message in java_cpp_enum.py.

Update error message in java_cpp_enum.py.

The new error message explains how to use brackets with multi-line
directive declarations, which is useful since this feature isn't
documented elsewhere.

Also changed the default value of |_path| in |HeaderParser| since it was
causing tests to raise exceptions because of a NoneType error.

BUG=652018
Committed: https://crrev.com/9c44c94152587aea8b0d4a83f0df00398c2a5bee
Cr-Commit-Position: refs/heads/master@{#432562}

[estevenson, 2016-11-15 18:53:47]

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

[estevenson, 2016-11-15 18:54:24]

estevenson@chromium.org changed reviewers:
+ agrieve@chromium.org

[estevenson, 2016-11-15 18:54:25]

ptal Andrew!

[commit-bot: I haz the power, 2016-11-15 18:54:35]

Dry run: 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, 2016-11-15 19:09:49]

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

[commit-bot: I haz the power, 2016-11-15 19:09:50]

Dry run: Try jobs failed on following builders:
  android_cronet on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_cron...)

[agrieve, 2016-11-15 19:27:35]

lgtm

[estevenson, 2016-11-15 21:48:49]

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

[commit-bot: I haz the power, 2016-11-15 21:49:36]

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

[estevenson, 2016-11-15 22:54:44]

estevenson@chromium.org changed reviewers:
+ mef@chromium.org

[estevenson, 2016-11-15 22:54:44]

mef@chromium.org: Please review changes in //net

[commit-bot: I haz the power, 2016-11-15 23:50:25]

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

[commit-bot: I haz the power, 2016-11-15 23:50:26]

Dry run: This issue passed the CQ dry run.

[mef, 2016-11-16 17:50:11]

net/ lgtm

[estevenson, 2016-11-16 18:15:59]

The CQ bit was checked by estevenson@chromium.org

[estevenson, 2016-11-16 18:16:00]

The patchset sent to the CQ was uploaded after l-g-t-m from agrieve@chromium.org
Link to the patchset: https://codereview.chromium.org/2505703002/#ps40001
(title: "Fix //net/base/request_priority.h empty prefix")

[commit-bot: I haz the power, 2016-11-16 18:16:44]

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, 2016-11-16 18:25:24]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-11-16 18:52:33]

Description was changed from

==========
Update error message in java_cpp_enum.py.

The new error message explains how to use brackets with multi-line
directive declarations, which is useful since this feature isn't
documented elsewhere.

Also changed the default value of |_path| in |HeaderParser| since it was
causing tests to raise exceptions because of a NoneType error.

BUG=652018
==========

to

==========
Update error message in java_cpp_enum.py.

The new error message explains how to use brackets with multi-line
directive declarations, which is useful since this feature isn't
documented elsewhere.

Also changed the default value of |_path| in |HeaderParser| since it was
causing tests to raise exceptions because of a NoneType error.

BUG=652018

Committed: https://crrev.com/9c44c94152587aea8b0d4a83f0df00398c2a5bee
Cr-Commit-Position: refs/heads/master@{#432562}
==========

[commit-bot: I haz the power, 2016-11-16 18:52:34]

Patchset 3 (id:??) landed as
https://crrev.com/9c44c94152587aea8b0d4a83f0df00398c2a5bee
Cr-Commit-Position: refs/heads/master@{#432562}