use OVERRIDE macro consistently in spdy_framer_test.cc

use OVERRIDE macro consistently in spdy_framer_test.cc

Followup to CL 485833002, which mixed use of the OVERRIDE macro and
bare override.

BUG=400336
Committed: https://crrev.com/db3bbbfe84dd4caab3a266a91d1204c45fb6c901
Cr-Commit-Position: refs/heads/master@{#294645}

[Mostyn Bramley-Moore, 2014-09-11 20:20:40]

mostynb@opera.com changed reviewers:
+ bnc@chromium.org, jgraettinger@chromium.org

[Mostyn Bramley-Moore, 2014-09-11 20:21:34]

@Johnny: can you please give this a thumbs-up?

[Bence, 2014-09-12 17:38:48]

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

[Bence, 2014-09-12 17:38:49]

rch:  PTAL.

Mostyn:  FYI Johnny has recently left the Chromium project.

[Ryan Hamilton, 2014-09-12 17:50:25]

The CQ bit was checked by rch@chromium.org

[Ryan Hamilton, 2014-09-12 17:50:25]

lgtm

[commit-bot: I haz the power, 2014-09-12 17:51:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/562353004/1

[commit-bot: I haz the power, 2014-09-12 18:52:11]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-12 18:52:12]

Try jobs failed on following builders:
  android_clang_dbg_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)

[Mostyn Bramley-Moore, 2014-09-12 20:08:34]

The CQ bit was checked by mostynb@opera.com

[commit-bot: I haz the power, 2014-09-12 20:10:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/562353004/1

[commit-bot: I haz the power, 2014-09-12 20:19:11]

Committed patchset #1 (id:1) as cd76b1b2beb47fb60bb18ffcff7792e152358854

[commit-bot: I haz the power, 2014-09-12 20:22:53]

Patchset 1 (id:??) landed as
https://crrev.com/db3bbbfe84dd4caab3a266a91d1204c45fb6c901
Cr-Commit-Position: refs/heads/master@{#294645}