Jumbo build fix: Rename some test constants in peerconnection

In jumbo builds many cc files compile in the same translation
unit. That means that they also share the same anonymous namespace
(which is per translation unit, not per file which would have
been better). In https://chromium-review.googlesource.com/c/1316836
and https://chromium-review.googlesource.com/c/1315534 two
peerconnection tests each added a kWriteBufferSize and a
kDelegateReadBufferSize with different values which broke
some jumbo build configurations (unluckily not the one in CQ but
some in fyi builders).

This renames the variables to have more unique names.

TBR=shampson@chromium.org,hbos@chromium.org

Bug: 874296
Change-Id: Ifc8af2be440f7a959b948c05e18deaf55aeefad2
Reviewed-on: https://chromium-review.googlesource.com/c/1322709
Reviewed-by: Daniel Bratell <bratell@opera.com>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#606002}
2 files changed