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Previously, this benchmark required a separate profile generation step as wel
as arguments. This isn't a Telemetric way to write a benchmark. Now, if a
profile isn't given, it generates the correct profile for the benchmark.

BUG=

Review URL: https://codereview.chromium.org/317733002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275458 0039d316-1c4b-4281-b951-d872f2087c98