LongSpider 3d-morph result check is inappropriate.
<https://webkit.org/b/130928>

Reviewed by Filip Pizlo.

The LongSpider 3d-morph component expected result check is incorrect.
The existing test checks if the leading digit of a sum starts with "-1".
However, it turned out that the expected sum is in the order of
-1.8735013540549517e-16 (i.e. very close to 0).  With small errors in
the terms of the sum adding up, it is very easy for the resultant sum 
to fluctuate.  There is no guarantee that the resultant sum's most
significant digit will start with -1 either.

The fix is to do a tolerance check on all the terms of the sum as well
as the total sum value instead.  The tolerance should be more lenient
for the sum which accumulates error from the individual terms, then for
individual terms.

* LongSpider/3d-morph.js:
(expect):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@166462 268f45cc-cd09-0410-ab3c-d52691b4dbfc