Fix compilation with SK_ENABLE_INST_COUNT=1

src/gpu/gl/GrGLInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLExtensions.h"
 #include "gl/GrGLUtil.h"
 
 #include <stdio.h>
 
-SK_DEFINE_INST_COUNT(GrGLInterface)
-
 #if GR_GL_PER_GL_FUNC_CALLBACK
 namespace {
 void GrGLDefaultInterfaceCallback(const GrGLInterface*) {}
 }
 #endif
 
 GrGLInterface::GrGLInterface() {
     fBindingsExported = kNone_GrGLBinding;
 
 #if GR_GL_PER_GL_FUNC_CALLBACK
@@ skipping 386 matching lines @@
             if (NULL == fBindVertexArray ||
                 NULL == fDeleteVertexArrays ||
                 NULL == fGenVertexArrays) {
                 return false;
             }
         }
     }
 
     return true;
 }