Add skstd::unique_ptr and use it.

include/gpu/gl/GrGLExtensions.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 GrGLExtensions_DEFINED
 #define GrGLExtensions_DEFINED
 
@@ skipping 10 matching lines @@
  */
 class SK_API GrGLExtensions {
 public:
     GrGLExtensions() : fInitialized(false), fStrings(new SkTArray<SkString>) {}
 
     GrGLExtensions(const GrGLExtensions&);
 
     GrGLExtensions& operator=(const GrGLExtensions&);
 
     void swap(GrGLExtensions* that) {
-        fStrings.swap(&that->fStrings);
+        fStrings.swap(that->fStrings);
         SkTSwap(fInitialized, that->fInitialized);
     }
 
     /**
      * We sometimes need to use this class without having yet created a GrGLInterface. This version
      * of init expects that getString is always non-NULL while getIntegerv and getStringi are non-
      * NULL if on desktop GL with version 3.0 or higher. Otherwise it will fail.
      */
     bool init(GrGLStandard standard,
               GrGLGetStringProc getString,
@@ skipping 20 matching lines @@
     void reset() { fStrings->reset(); }
 
     void print(const char* sep = "\n") const;
 
 private:
     bool                                fInitialized;
     SkAutoTDelete<SkTArray<SkString> >  fStrings;
 };
 
 #endif