Check alpha-sorting of includes during presubmit.

src/flags.h

 // Copyright 2006-2008 the V8 project 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 V8_FLAGS_H_
 #define V8_FLAGS_H_
 
 #include "src/globals.h"
 
 namespace v8 {
 namespace internal {
 
 // Declare all of our flags.
 #define FLAG_MODE_DECLARE
-#include "src/flag-definitions.h"
+#include "src/flag-definitions.h"  // NOLINT
 
 // The global list of all flags.
 class FlagList {
  public:
   // The list of all flags with a value different from the default
   // and their values. The format of the list is like the format of the
   // argv array passed to the main function, e.g.
   // ("--prof", "--log-file", "v8.prof", "--nolazy").
   //
   // The caller is responsible for disposing the list, as well
@@ skipping 29 matching lines @@
   // Print help to stdout with flags, types, and default values.
   static void PrintHelp();
 
   // Set flags as consequence of being implied by another flag.
   static void EnforceFlagImplications();
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FLAGS_H_