Minor HttpStreamFactoryImplJobControllerTest cleanup.

In http_stream_factory_impl_job_controller_unittest.cc,
* move all test cases into namespace test,
* remove test:: namespace qualifiers,
* move most SequencedSocketData and all SSLSocketDataProvider instances
  from heap to stack.  In certain cases, this requires storing them
  in a std::list instead of a std::vector, because they are
  not copyable.

BUG=475060

Change-Id: I28a6b95e0b19abcec4255cf7c8af5bbad16921a1
Reviewed-on: https://chromium-review.googlesource.com/540215
Reviewed-by: Helen Li <xunjieli@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#480805}

• net/http/http_stream_factory_impl_job.h[diff]
• net/http/http_stream_factory_impl_job_controller.h[diff]
• net/http/http_stream_factory_impl_job_controller_unittest.cc[diff]