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Use NoopDecoderStreamErrorDelegate and NoopQpackStreamSenderDelegate
implementations from test_tools instead of defining new ones.  There is
no need to crash on decoder stream errors or encoder stream data,
because |qpack_encoder_| is set up not to use the dynamic table and no
decoder stream data is fed to it.

Also add const qualifier to four methods.

Change-Id: Ibd103f3598458f2369e4ff7ce37b3855bfeabfef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1986259
Auto-Submit: Bence Béky <bnc@chromium.org>
Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728282}