Misc cleanup: remove unused, fix comment, improve logging.

Change logging in StaticSocketDataHelper::VerifyWriteData() such that if
writted data does not match mock write, then print actual written data in full length, not
only truncated to the length of the mock write data.

Remove unused StaticSocketDataProvider:CompleteRead().

The rest of this CL belongs to https://crbug.com/810752:

Inline ConstructSpdyGoAway() as ConstructSpdyGoAway(0).

Remove unused struct SpdyHeaderInfo.

Remove obsolete "The caller takes ownership of the frame." comment from
spdy_test_util_common.h, leftover from when methods used to return raw
pointers.  This is a follow-up to
https://crrev.com/2156643002/diff/1/net/spdy/spdy_test_util_common.h.

Also remove useless "Returns a SpdySerializedFrame." comments from the
line above the definition showing return type SpdySerializedFrame.

Bug: 600438, 810752
Change-Id: I1f3471f4e4a9b71603257cf82986d0efe0288c7f
Reviewed-on: https://chromium-review.googlesource.com/912013
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535993}
6 files changed