Replacing the OVERRIDE with override in tools folder

tools/gn/setup.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_SETUP_H_
 #define TOOLS_GN_SETUP_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 96 matching lines @@
   // the user omits the build directory argument (which is easy to do).
   bool DoSetup(const std::string& build_dir, bool force_create);
 
   // Runs the load, returning true on success. On failure, prints the error
   // and returns false. This includes both RunPreMessageLoop() and
   // RunPostMessageLoop().
   bool Run();
 
   Scheduler& scheduler() { return scheduler_; }
 
-  virtual Scheduler* GetScheduler() OVERRIDE;
+  virtual Scheduler* GetScheduler() override;
 
   // Returns the file used to store the build arguments. Note that the path
   // might not exist.
   SourceFile GetBuildArgFile() const;
 
   // Sets whether the build arguments should be filled during setup from the
   // command line/build argument file. This will be true by default. The use
   // case for setting it to false is when editing build arguments, we don't
   // want to rely on them being valid.
   void set_fill_arguments(bool fa) { fill_arguments_ = fa; }
@@ skipping 74 matching lines @@
   // default copy constructor.
   DependentSetup(Setup* derive_from);
   DependentSetup(DependentSetup* derive_from);
   virtual ~DependentSetup();
 
   // These are the two parts of Run() in the regular setup, not including the
   // call to actually run the message loop.
   void RunPreMessageLoop();
   bool RunPostMessageLoop();
 
-  virtual Scheduler* GetScheduler() OVERRIDE;
+  virtual Scheduler* GetScheduler() override;
 
  private:
   Scheduler* scheduler_;
 };
 
 #endif  // TOOLS_GN_SETUP_H_