Check accessibility of org.apache.http.legacy classes

Ran the following before and after removing org.apache.http.legacy.boot
from the bootclasspath. Passed before, failed afterwards.
    cts/tests/signature/runSignatureTests.sh \
        CtsApacheHttpLegacyCurrentApiSignatureTestCases

Bug: 18027885
Test: See above
Change-Id: Ifb6870e102e1e9086ba82d6ca7400b6c3d17afac
5 files changed