Update the perf expectations to silence a few flaky Perf Improve.
Update the perf expectations to silence a few flaky Perf Improve.

http://build.chromium.org/f/chromium/perf/vista-release-single-core/intl1/report.html?history=150&rev=111249 : unclear where the improvement comes from.
http://build.chromium.org/f/chromium/perf/xp-release-dual-core/morejs/report.html?history=150&rev=111249 : No real improvement, just expanding the range.
http://build.chromium.org/f/chromium/perf/linux-release-lowmem/moz/report.html?history=150&rev=111263 : No real improvement, just expanding the range.

TBR:cmp
Review URL: http://codereview.chromium.org/8674004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@111376 0039d316-1c4b-4281-b951-d872f2087c98

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