[Extensions] Clean up comments in safe_builtins.h/cc

extensions/renderer/safe_builtins.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_RENDERER_SAFE_BUILTINS_H_
 #define EXTENSIONS_RENDERER_SAFE_BUILTINS_H_
 
+#include "base/macros.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
 class ScriptContext;
 
-// A collection of safe builtin objects, in that they won't be tained by
+// A collection of safe builtin objects, in that they won't be tainted by
 // extensions overriding methods on them.
 class SafeBuiltins {
  public:
   // Creates the v8::Extension which manages SafeBuiltins instances.
   static v8::Extension* CreateV8Extension();
 
   explicit SafeBuiltins(ScriptContext* context);
-
-  virtual ~SafeBuiltins();
+  ~SafeBuiltins();
 
   // Each method returns an object with methods taken from their respective
   // builtin object's prototype, adapted to automatically call() themselves.
   //
   // Examples:
   //   Array.prototype.forEach.call(...) becomes Array.forEach(...)
   //   Object.prototype.toString.call(...) becomes Object.toString(...)
   //   Object.keys.call(...) becomes Object.keys(...)
   v8::Local<v8::Object> GetArray() const;
   v8::Local<v8::Object> GetFunction() const;
   v8::Local<v8::Object> GetJSON() const;
   // NOTE(kalman): VS2010 won't compile "GetObject", it mysteriously renames it
   // to "GetObjectW" - hence GetObjekt. Sorry.
   v8::Local<v8::Object> GetObjekt() const;
   v8::Local<v8::Object> GetRegExp() const;
   v8::Local<v8::Object> GetString() const;
   v8::Local<v8::Object> GetError() const;
 
  private:
   ScriptContext* context_;
+
+  DISALLOW_COPY_AND_ASSIGN(SafeBuiltins);
 };
 
 }  //  namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_SAFE_BUILTINS_H_