Remove support for MSVC

sky/engine/wtf/text/StringImpl.h

Index: sky/engine/wtf/text/StringImpl.h
diff --git a/sky/engine/wtf/text/StringImpl.h b/sky/engine/wtf/text/StringImpl.h
index 2c35a29413685f9f03114ef3759f841a3612a8e5..6367f0c8f3bb5b015f12bf326293de463e01a48e 100644
--- a/sky/engine/wtf/text/StringImpl.h
+++ b/sky/engine/wtf/text/StringImpl.h
@@ -32,14 +32,6 @@
 #include "wtf/WTFExport.h"
 #include "wtf/unicode/Unicode.h"
 
-#if USE(CF)
-typedef const struct __CFString * CFStringRef;
-#endif
-
-#ifdef __OBJC__
-@class NSString;
-#endif
-
 namespace WTF {
 
 struct AlreadyHashed;
@@ -50,7 +42,6 @@ struct LCharBufferTranslator;
 struct CharBufferFromLiteralDataTranslator;
 struct SubstringTranslator;
 struct UCharBufferTranslator;
-template<typename> class RetainPtr;
 
 enum TextCaseSensitivity { TextCaseSensitive, TextCaseInsensitive };
 
@@ -399,13 +390,6 @@ public:
     PassRefPtr<StringImpl> replace(unsigned index, unsigned len, StringImpl*);
     PassRefPtr<StringImpl> upconvertedString();
 
-#if USE(CF)
-    RetainPtr<CFStringRef> createCFString();
-#endif
-#ifdef __OBJC__
-    operator NSString*();
-#endif
-
 #ifdef STRING_STATS
     ALWAYS_INLINE static StringStats& stringStats() { return m_stringStats; }
 #endif