[Android] ForeignSessionHelper string memory leak fix.

[Android] Delete local java reference every loop.

In ForeignSessionHelper class, there were two places
we allocate ScopedJavaLocalRef<jstring> inside a loop and
doesn't delete. The Java local references are cleaned upon
returning to Java, but there is 512 local reference hard-limit 
so we should delete it every loop to avoid hitting the limit.

BUG=366659
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266398

[Kibeom Kim (inactive), 2014-04-24 23:39:42]

ptal

[Feng Qian, 2014-04-24 23:50:12]

On 2014/04/24 23:39:42, Kibeom Kim wrote:
> ptal

lgtm

[Kibeom Kim (inactive), 2014-04-25 03:17:39]

On 2014/04/24 23:50:12, Feng Qian wrote:
> On 2014/04/24 23:39:42, Kibeom Kim wrote:
> > ptal
> 
> lgtm

David: owner lgtm?

[Kibeom Kim (inactive), 2014-04-25 20:48:32]

+owner @newt

[newt (away), 2014-04-25 22:05:39]

lgtm

[Kibeom Kim (inactive), 2014-04-25 22:05:52]

The CQ bit was checked by kkimlabs@chromium.org

[commit-bot: I haz the power, 2014-04-25 22:29:21]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kkimlabs@chromium.org/257513007/30001

[commit-bot: I haz the power, 2014-04-26 00:26:16]

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

[commit-bot: I haz the power, 2014-04-26 00:26:16]

Try jobs failed on following builders:
  tryserver.chromium on win_chromium_rel

[Kibeom Kim (inactive), 2014-04-26 00:26:41]

The CQ bit was checked by kkimlabs@chromium.org

[commit-bot: I haz the power, 2014-04-26 00:31:22]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kkimlabs@chromium.org/257513007/30001

[commit-bot: I haz the power, 2014-04-26 06:33:57]

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

[commit-bot: I haz the power, 2014-04-26 06:33:58]

Try jobs failed on following builders:
  tryserver.chromium on win_chromium_rel

[Kibeom Kim (inactive), 2014-04-26 06:36:57]

The CQ bit was checked by kkimlabs@chromium.org

[commit-bot: I haz the power, 2014-04-26 06:37:19]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kkimlabs@chromium.org/257513007/30001

[commit-bot: I haz the power, 2014-04-27 00:18:10]

Change committed as 266398

[tapted, 2014-04-28 01:04:18]

A revert of this CL has been created in
https://codereview.chromium.org/254713007/ by tapted@chromium.org.

The reason for reverting is: The CQ seems to have ignored the trybot failures on
`android_dbg_triggered_tests`. Step `unit_tests` failing since
http://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/13319

Failures on GCMServiceTest.* and ZipTest.ZipTimeStamp. Suspecting this CL..