Return a new vector rather than appending to the parameter.
Delimiters are also a string rather than a character. Split on any
character in the string.
Change-Id: I039b332ace5578590df9e7ca0e8fa3db28db30a3
These are useful outside of ART. Nothing changed (aside from fixing
Trim to not segfault on empty strings), so ART should be able to move
to using these.
Change-Id: Id026ebffe8d31f784a91834786ab189680b13a0f
