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Defines a list 'net_test_extra_libs' that is included in
net_java_test_support. org.apache.http is deprecated and being removed.
This enables temporary inclusion of a replacement jar until the
dependency is removed.

BUG=488192

Review URL: https://codereview.chromium.org/1138013007

Cr-Commit-Position: refs/heads/master@{#330105}