ICU 4.6 NumberFormat::EStyle enum is gone in ICU 4.8. Adding #if #else to make it work across versions.
There was an ICU cleanup (removing all C++ style enums and replacing them with plain C enums). NumberFormat::EStyle had a draft status (from ICU 4.2) and it was cut. Confusion came up because DateFormat::EStyle is stable and won't be removed.
TEST=Compile Chromium with ICU 4.6 and ICU 4.8
BUG=1561
Review URL: http://codereview.chromium.org/7421003
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8701
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