The NS_LITERAL_STRING macro creates a temporary nsLiteralString to encapsulate the char16_t string literal and its length, but AssignLiteral() can determine the char16_t string literal's length at compile-time without nsLiteralString.
MozReview-Commit-ID: 6vgQiU8zN3o
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extra : rebase_source : 1b536b92ef43f610db057ace6f108620e8d8b4d5
extra : source : 336e21386d5eeb16f1c9893c29377f23b67cc4b0