SkNonCopyable should be used with private inheritance.

include/core/SkBitmap.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmap_DEFINED
 #define SkBitmap_DEFINED
 
@@ skipping 793 matching lines @@
      bitmap, and return it (this is the amount to shift matrix iterators
      by). If dst is not null, it is set to the correct level.
      */
     int extractMipLevel(SkBitmap* dst, SkFixed sx, SkFixed sy);
     bool hasMipMap() const;
     void freeMipMap();
 
     friend struct SkBitmapProcState;
 };
 
-class SkAutoLockPixels : public SkNoncopyable {
+class SkAutoLockPixels : SkNoncopyable {
 public:
     SkAutoLockPixels(const SkBitmap& bm, bool doLock = true) : fBitmap(bm) {
         fDidLock = doLock;
         if (doLock) {
             bm.lockPixels();
         }
     }
     ~SkAutoLockPixels() {
         if (fDidLock) {
             fBitmap.unlockPixels();
         }
     }
 
 private:
     const SkBitmap& fBitmap;
     bool            fDidLock;
 };
 //TODO(mtklein): uncomment when 71713004 lands and Chromium's fixed.
 //#define SkAutoLockPixels(...) SK_REQUIRE_LOCAL_VAR(SkAutoLockPixels)
 
 /** Helper class that performs the lock/unlockColors calls on a colortable.
     The destructor will call unlockColors(false) if it has a bitmap's colortable
 */
-class SkAutoLockColors : public SkNoncopyable {
+class SkAutoLockColors : SkNoncopyable {
 public:
     /** Initialize with no bitmap. Call lockColors(bitmap) to lock bitmap's
         colortable
      */
     SkAutoLockColors() : fCTable(NULL), fColors(NULL) {}
     /** Initialize with bitmap, locking its colortable if present
      */
     explicit SkAutoLockColors(const SkBitmap& bm) {
         fCTable = bm.getColorTable();
         fColors = fCTable ? fCTable->lockColors() : NULL;
@@ skipping 69 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 //
 // Helpers until we can fully deprecate SkBitmap::Config
 //
 extern SkBitmap::Config SkColorTypeToBitmapConfig(SkColorType);
 extern SkColorType SkBitmapConfigToColorType(SkBitmap::Config);
 
 #endif