jni: Remove no-longer-needed calls to NewLocalRef.

jni: Remove no-longer-needed calls to NewLocalRef.

We no longer need to explicitly create new local references to put into
ScopedJavaLocalRef to avoid JNI warnings; we can just pass JavaParamRefs
around safely now. Remove temporary fixes added in
https://codereview.chromium.org/1278823006 and do that instead.

BUG=506850
Committed: https://crrev.com/9d46f6be2e866a727a83da5096cca87ee722532d
Cr-Commit-Position: refs/heads/master@{#347396}

[Torne, 2015-09-04 13:05:23]

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

[Yaron, 2015-09-04 13:32:57]

lgtm

[Torne, 2015-09-04 13:33:49]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2015-09-04 13:34:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1324453006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1324453006/1

[commit-bot: I haz the power, 2015-09-04 13:57:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-04 13:58:00]

Patchset 1 (id:??) landed as
https://crrev.com/9d46f6be2e866a727a83da5096cca87ee722532d
Cr-Commit-Position: refs/heads/master@{#347396}