Stop throwing exceptions for out-of-range accesses to CanvasArrays....

Stop throwing exceptions for out-of-range accesses to CanvasArrays.
This is per resolution in the WebGL working group to make these types
match the WebIDL IndexSetter and IndexGetter semantics, which are
still being defined but will very likely not throw.


Committed: http://code.google.com/p/v8/source/detail?r=3117

[Christian Plesner Hansen, 2009-10-23 08:59:18]

Lgtm