fixed style mistake found in presubmit.py

src/d8.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 886 matching lines @@
           OnExit();
           return 1;
         }
       }
     }
 
     // Start preemption if threads have been created and preemption is enabled.
     if (threads.length() > 0 && use_preemption) {
       Locker::StartPreemption(preemption_interval);
     }
-
   }
 
   for (int i = 0; i < threads.length(); i++) {
     i::Thread* thread = threads[i];
     thread->Join();
     delete thread;
   }
   OnExit();
   return 0;
 }
@@ skipping 55 matching lines @@
   if (run_shell) {
     InstallUtilityScript();
     RunShell();
   }
 
   v8::V8::Dispose();
 
   return result;
 }
 
-} // namespace v8
+}  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif