Update the Perf BSS expectations after rolling in VP9 dependencies.

Update the Perf BSS expectations after rolling in VP9 dependencies.
The WebRtc roll in VP9 dependency https://codereview.chromium.org/703443004/.
WebRtc submit: https://code.google.com/p/webrtc/source/detail?r=7588

"linux-release/sizes/chrome-bss/bss": {"reva": 302608, "revb": 302608, "type":
     "absolute", "better": "lower", "improve": 501584, "regress": 554384, "sha1": "63
     34ce61"},

BUG=424235
R=tommi@chromium.org
TBR=andrewhayden@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/84dc546d15b57632feb2ec00a133f6c2935b74a7

[perkj_chrome, 2014-11-04 16:13:28]

perkj@chromium.org changed reviewers:
+ tommi@chromium.org

[perkj_chrome, 2014-11-04 16:22:27]

perkj@chromium.org changed reviewers:
+ andrewhayden@chromium.org

[perkj_chrome, 2014-11-04 16:22:44]

Can you please review?

[tommi (sloooow) - chröme, 2014-11-04 16:34:53]

lgtm

[commit-bot: I haz the power, 2014-11-04 16:36:26]

Patchset 1 (id:??) landed as
https://crrev.com/84dc546d15b57632feb2ec00a133f6c2935b74a7
Cr-Commit-Position: refs/heads/master@{#302616}

[perkj_chrome, 2014-11-04 16:36:29]

Committed patchset #1 (id:1) manually as
84dc546d15b57632feb2ec00a133f6c2935b74a7 (presubmit successful).