AK: Remove unimplemented methods

Author: https://github.com/AtkinsSJ
Commit: https://github.com/SerenityOS/serenity/commit/09a22ddb2a
Pull-request: https://github.com/SerenityOS/serenity/pull/17203
Reviewed-by: https://github.com/linusg ✅

AK/DeprecatedString.h

@@ -215,12 +215,10 @@ public:
     bool operator==(DeprecatedFlyString const&) const;
 
     bool operator<(DeprecatedString const&) const;
-    bool operator<(char const*) const;
     bool operator>=(DeprecatedString const& other) const { return !(*this < other); }
     bool operator>=(char const* other) const { return !(*this < other); }
 
     bool operator>(DeprecatedString const&) const;
-    bool operator>(char const*) const;
     bool operator<=(DeprecatedString const& other) const { return !(*this > other); }
     bool operator<=(char const* other) const { return !(*this > other); }
 

AK/IntrusiveList.h

@@ -112,7 +112,6 @@ public:
             m_value = IntrusiveList<T, Container, member>::prev(m_value);
             return *this;
         }
-        ReverseIterator& erase();
 
     private:
         T* m_value { nullptr };