Move UnicodeRange to Source/platform/text/

(fixed all style issues except for the 400 or so in UnicodeRange.cpp)

BUG=297477

Review URL: https://codereview.chromium.org/25666013

git-svn-id: svn://svn.chromium.org/blink/trunk@158896 bbb929c8-8fbe-4397-9dbb-9b2b20218538