Fix a few clang errors while trying to build tools target.

include/core/SkUtils.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 SkUtils_DEFINED
 #define SkUtils_DEFINED
 
@@ skipping 108 matching lines @@
 class SkAutoMemoryUsageProbe {
 public:
     /** Record memory usage in constructor, and dump the result
         (delta and current total) in the destructor, with the optional
         label. NOTE: label contents are not copied, just the ptr is
         retained, so DON'T DELETE IT.
     */
     SkAutoMemoryUsageProbe(const char label[]);
     ~SkAutoMemoryUsageProbe();
 private:
-    const char* fLabel;

[scroggo, 2013/03/24 14:58:01]

I wonder if we should just #if 0 or remove the entire class. It appears that the
class is not used by chromium or skia. Without these variables (which are if 0'd
out already), the code does not do anything.

-    size_t      fBytesAllocated;
 };
 
 #endif