Don't throw UnsupportedOpEx on multi-char negative/percent symbols.

There seem to be a fair number of apps that call through to this
function, so just give them a "bogus" value (from Locale.ROOT) when
we encounter a multi-char symbol. The formatters and other java.text
APIs already use the correct multi-char value.

bug: 18785260
Change-Id: I80f2852fadbb590d598e4e38795e71fd12566c38
2 files changed