Replacing the OVERRIDE with override in tools folder

tools/gn/target.h

 // Copyright (c) 2013 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 TOOLS_GN_TARGET_H_
 #define TOOLS_GN_TARGET_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 40 matching lines @@
   typedef std::vector<SourceFile> FileList;
   typedef std::vector<std::string> StringVector;
 
   Target(const Settings* settings, const Label& label);
   virtual ~Target();
 
   // Returns a string naming the output type.
   static const char* GetStringForOutputType(OutputType type);
 
   // Item overrides.
-  virtual Target* AsTarget() OVERRIDE;
-  virtual const Target* AsTarget() const OVERRIDE;
-  virtual bool OnResolved(Err* err) OVERRIDE;
+  virtual Target* AsTarget() override;
+  virtual const Target* AsTarget() const override;
+  virtual bool OnResolved(Err* err) override;
 
   OutputType output_type() const { return output_type_; }
   void set_output_type(OutputType t) { output_type_ = t; }
 
   // Can be linked into other targets.
   bool IsLinkable() const;
 
   // Can have dependencies linked in.
   bool IsFinal() const;
 
@@ skipping 251 matching lines @@
 };
 #elif defined(COMPILER_MSVC)
 inline size_t hash_value(const Target* t) {
   return reinterpret_cast<size_t>(t);
 }
 #endif  // COMPILER...
 
 }  // namespace BASE_HASH_NAMESPACE
 
 #endif  // TOOLS_GN_TARGET_H_