fixed style mistake found in presubmit.py

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 6371f86fd2fe59957e56308a00ccc8e381018016..022860ead8dcc68e03d6bd54d4d1907372c237e2 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -904,7 +904,6 @@ int Shell::RunMain(int argc, char* argv[]) {
     if (threads.length() > 0 && use_preemption) {
       Locker::StartPreemption(preemption_interval);
     }
-
   }
 
   for (int i = 0; i < threads.length(); i++) {
@@ -980,7 +979,7 @@ int Shell::Main(int argc, char* argv[]) {
   return result;
 }
 
-} // namespace v8
+}  // namespace v8
 
 
 #ifndef GOOGLE3