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Change NetLogSpdyStreamErrorCallback() to stringify error.
Example netlog output before this change:

HTTP2_STREAM_ERROR
--> description = "SPDY stream closed with error_code: 2"
--> status = -337
--> stream_id = 59

After this change:

HTTP2_STREAM_ERROR
--> description = "SPDY stream closed with error_code: 2"
--> error = SPDY_PROTOCOL_ERROR
--> stream_id = 59

Change-Id: If58ad76f3b99dde7f22e8bf81c2251f6fba9d2e3
Reviewed-on: https://chromium-review.googlesource.com/594192
Commit-Queue: Bence Béky <bnc@chromium.org>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491176}