Remove some unused functions in core

Source/core/css/CSSPropertySourceData.h

 /*
  * Copyright (c) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 39 matching lines @@
 
     unsigned start;
     unsigned end;
 };
 
 struct CSSPropertySourceData {
     ALLOW_ONLY_INLINE_ALLOCATION();
 public:
     CSSPropertySourceData(const String& name, const String& value, bool important, bool disabled, bool parsedOk, const SourceRange& range);
     CSSPropertySourceData(const CSSPropertySourceData& other);
-    CSSPropertySourceData();
-
-    String toString() const;
-    unsigned hash() const;
 
     void trace(Visitor* visitor) { visitor->trace(range); }
 
     String name;
     String value;
     bool important;
     bool disabled;
     bool parsedOk;
     SourceRange range;
 };
@@ skipping 102 matching lines @@
     RefPtrWillBeMember<CSSMediaSourceData> mediaSourceData;
 };
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::SourceRange);
 WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::CSSPropertySourceData);
 WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::CSSMediaQueryExpSourceData);
 
 #endif // CSSPropertySourceData_h