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We have limited number of jni local references, leaking jobjects inside
loop may cause local reference table to overflow.

Bug: 726426
Change-Id: I4b1ffc9fcb74d1a78d0415f9d9c79533facb7839
Reviewed-on: https://chromium-review.googlesource.com/895843
Commit-Queue: Ran Ji <ranj@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533744}