GitLab

Use SequencedSocketData in SpdySessionTest.

* Use SequencedSocketData instead of DeterministicSocketData in SpdySessionTest.
* Use nullptr instead of NULL, EXPECT_FALSE() instead of EXPECT_EQ(nullptr), etc.
* Uniformly use RunLoop() instead of MessageLoop::current().
* Remove unnecessary set_connect_data calls.

BUG=492698

Review URL: https://codereview.chromium.org/1153653003

Cr-Commit-Position: refs/heads/master@{#333122}