Update expectations.

      mac-release/sizes: http://build.chromium.org/f/chromium/perf/mac-release/sizes/report.html?history=50&header=Chromium.app&graph=Chromium.app&rev=236257

TBR=cmp@chromium.org
BUG=321688

Review URL: https://codereview.chromium.org/78773003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236261 0039d316-1c4b-4281-b951-d872f2087c98