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Simplify NetLogWithSource management in SpdyNetworkTransactionTest.

Every SpdyNetworkTransactionTest needs a NetLogWithSource instance.
This CL makes it a test base class member and passes it on to every
place where it is needed.

Change-Id: I726de3dc35e107a89512ca94b80cd82faddf6635
Reviewed-on: https://chromium-review.googlesource.com/672906Reviewed-by: Helen Li <xunjieli@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502906}