Simplify test http_server_properties member access.

Simplify test http_server_properties member access.

Append underscore to the name of
QuicNetworkTransactionTest::http_server_properties member to match other
members.  Use it directly instead of *(session_->http_server_properties)
throughout tests.

BUG=

Committed: https://crrev.com/6be245c19fae40f10662ace782ddc85a05781ffb
Cr-Commit-Position: refs/heads/master@{#330078}

[Bence, 2015-05-14 21:20:35]

bnc@chromium.org changed reviewers:
+ rch@chromium.org

[Bence, 2015-05-14 21:20:36]

Ryan, PTAL.  Thanks.

[Ryan Hamilton, 2015-05-15 04:06:47]

lgtm

[Bence, 2015-05-15 11:20:45]

The CQ bit was checked by bnc@chromium.org

[commit-bot: I haz the power, 2015-05-15 11:21:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1130783008/1

[commit-bot: I haz the power, 2015-05-15 11:24:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-15 11:25:46]

Patchset 1 (id:??) landed as
https://crrev.com/6be245c19fae40f10662ace782ddc85a05781ffb
Cr-Commit-Position: refs/heads/master@{#330078}