fix leaks in SkConf

include/utils/SkRTConf.h

 /*
  * Copyright 2013 Google, Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkRTConf_DEFINED
 #define SkRTConf_DEFINED
@@ skipping 56 matching lines @@
 
 /** \class SkRTConfRegistry
     A class that maintains a systemwide registry of all runtime configuration
     parameters.  Mainly used for printing them out and handling multiply-defined
     knobs.
 */
 
 class SkRTConfRegistry {
 public:
     SkRTConfRegistry();
+    ~SkRTConfRegistry();
     void printAll(const char *fname = NULL) const;
     bool hasNonDefault() const;
     void printNonDefault(const char *fname = NULL) const;
     const char *configFileLocation() const;
     void possiblyDumpFile() const;
     void validate() const;
     template <typename T> void set(const char *confname,
                                    T value,
                                    bool warnIfNotFound = true);
 #ifdef SK_SUPPORT_UNITTEST
@@ skipping 98 matching lines @@
     // static_cast here is okay because there's only one kind of child class.
     const SkRTConf<T> *child_pointer = static_cast<const SkRTConf<T> *>(conf);
     return child_pointer &&
            fName == child_pointer->fName &&
            fDescription == child_pointer->fDescription &&
            fValue == child_pointer->fValue &&
            fDefault == child_pointer->fDefault;
 }
 
 #endif