Update LayoutUnit rounding unit test
https://bugs.webkit.org/show_bug.cgi?id=107322

Reviewed by Levi Weintraub.
        
Update the LayoutUnitRounding test to use fromFloatRound for
values that cannot accurately be represented as a LayoutUnit
(the default behavior is to floor the value to the nearest
LayoutUnit).

* TestWebKitAPI/Tests/WebCore/LayoutUnit.cpp:
(TestWebKitAPI::TEST):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140205 268f45cc-cd09-0410-ab3c-d52691b4dbfc