- write a portable ICU version of TextEncoding::fromUnicode for use on win32

        * platform/StreamingTextDecoder.h:
        * platform/TextEncoding.cpp:
        (WebCore::TextEncoding::fromUnicode): added
        (WebCore::getConverter): helper
        (WebCore::cacheConverter): ditto
        (WebCore::effectiveEncoding): ditto
        * platform/mac/TextEncodingMac.cpp: Add comment
        * platform/win/TemporaryLinkStubs.cpp:
        (WebCore::TextEncoding::fromUnicode): remove



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@13046 268f45cc-cd09-0410-ab3c-d52691b4dbfc