Quic has similar upper case ascii checks. We can look into whether that (SpdyUtils::CopyAndValidateHeaders() and QuicTextUtils::ContainsUpperCase()) can use the same change as Spdy.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bbd225775340d6f88a2080a0d1cdb7da403a0d2b

commit bbd225775340d6f88a2080a0d1cdb7da403a0d2b
Author: Minjeong Lee <apenr1234@gmail.com>
Date: Tue Nov 28 14:37:25 2017

Moved Checking Uppercase in header from SpdyStream::SaveResponseHeaders() to HeaderCoalescer::AddHeader()

Bug:  695495 
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ie277eaec092ee1d7541c278a7501d48902473a0d
Reviewed-on: https://chromium-review.googlesource.com/775551
Reviewed-by: Bence Béky <bnc@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519678}
[modify] https://crrev.com/bbd225775340d6f88a2080a0d1cdb7da403a0d2b/net/http/bidirectional_stream_unittest.cc
[modify] https://crrev.com/bbd225775340d6f88a2080a0d1cdb7da403a0d2b/net/spdy/chromium/bidirectional_stream_spdy_impl_unittest.cc
[modify] https://crrev.com/bbd225775340d6f88a2080a0d1cdb7da403a0d2b/net/spdy/chromium/header_coalescer.cc
[modify] https://crrev.com/bbd225775340d6f88a2080a0d1cdb7da403a0d2b/net/spdy/chromium/header_coalescer_test.cc
[modify] https://crrev.com/bbd225775340d6f88a2080a0d1cdb7da403a0d2b/net/spdy/chromium/spdy_stream.cc