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Revert of Remove unnecessary static function (patchset #2 of https://codereview.chromium.org/444983002/)

Reason for revert:
Perf regression, due to the method no longer being inline, and using doubles instead of floats.

Original issue's description:
> Remove unnecessary static function
> 
> Use gfx::CrossProduct() instead of defining a new static function.
> 
> BUG=
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=288372

TBR=enne@chromium.org,heejin.r.chung@samsung.com
NOTREECHECKS=true
NOTRY=true
BUG=402552

Review URL: https://codereview.chromium.org/471113002

Cr-Commit-Position: refs/heads/master@{#289645}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289645 0039d316-1c4b-4281-b951-d872f2087c98