Fix for CLDR plural rule parser for old browsers without String.trim

This fixes MobileFrontend's "last modified" message on Kindle 3.4

Submitted upstream as https://github.com/santhoshtr/CLDRPluralRuleParser/pull/10

Bug: 62072
Change-Id: I350264847417f521c111e3cb81da46805608425a
Merge "Fix for CLDR plural rule parser for old browsers without String.trim"