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Stream requests unlike unary requests don't set the request timeout,
since that would simply destroy the stream if it hasn't been closed
within the timeout.

This CL adds a OneShotTimer to ProtobufHttpStreamRequest to run the
StreamClosedCallback with DEADLINE_EXCEEDED if the stream does not
receive its first data within the timeout.

Bug: 1123199
Change-Id: Iaeb9c5c4f896d2a24378bb83c57d2d39ab49312c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386280
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803615}