Use parens in multilne C++ -> Java enum generator directives.

Use parens in multilne C++ -> Java enum generator directives.

Backslashes in comments produce a compile error (as the compiler
interprets them as 'multi-line single-line comments'). This requires
a different way of denoting mulit-line directives. Parens seem
like a reasonably natural syntax for this.

BUG=None
TEST=java_cpp_enum_tests.py
R=jbudorick@chromium.org

Committed: https://crrev.com/2f65eb2d9c327d2bd93d079b7b6c2924e1959df5
Cr-Commit-Position: refs/heads/master@{#311073}

[mkosiba (inactive), 2015-01-12 17:00:41]

The CQ bit was checked by mkosiba@chromium.org

[commit-bot: I haz the power, 2015-01-12 17:01:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/842043003/1

[commit-bot: I haz the power, 2015-01-12 17:01:43]

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

[commit-bot: I haz the power, 2015-01-12 17:01:44]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[jbudorick, 2015-01-12 17:05:20]

lgtm

[mkosiba (inactive), 2015-01-12 17:08:10]

The CQ bit was checked by mkosiba@chromium.org

[commit-bot: I haz the power, 2015-01-12 17:08:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/842043003/1

[commit-bot: I haz the power, 2015-01-12 18:40:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-12 18:40:56]

Patchset 1 (id:??) landed as
https://crrev.com/2f65eb2d9c327d2bd93d079b7b6c2924e1959df5
Cr-Commit-Position: refs/heads/master@{#311073}