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If the QPC value is less than 44 bits, it is safe to multiply by a 20 bits
value (1000000) without risking overflow. This optimization reduces the
call time by half.

BUG=158234

Review URL: https://codereview.chromium.org/429743002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287704 0039d316-1c4b-4281-b951-d872f2087c98