Keep two empty lines between declarations for cpp files

test/cctest/test-list.cc

 // Copyright 2011 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 33 matching lines @@
     return result + 1;
   }
 
   static void Delete(void* ptr) {
     size_t* true_ptr = reinterpret_cast<size_t*>(ptr) - 1;
     memset(true_ptr, 0, *true_ptr);
     free(true_ptr);
   }
 };
 
+
 // Check that we can add (a reference to) an element of the list
 // itself.
 TEST(ListAdd) {
   // Add elements to the list to grow it to its capacity.
   List<int, ZeroingAllocationPolicy> list(4);
   list.Add(1);
   list.Add(2);
   list.Add(3);
   list.Add(4);
 
   // Add an existing element, the backing store should have to grow.
   list.Add(list[0]);
   CHECK_EQ(1, list[4]);
 }
 
+
 // Test that we can add all elements from a list to another list.
 TEST(ListAddAll) {
   List<int, ZeroingAllocationPolicy> list(4);
   list.Add(0);
   list.Add(1);
   list.Add(2);
 
   CHECK_EQ(3, list.length());
   for (int i = 0; i < 3; i++) {
     CHECK_EQ(i, list[i]);
@@ skipping 75 matching lines @@
 
 TEST(DeleteEmpty) {
   {
     List<int>* list = new List<int>(0);
     delete list;
   }
   {
     List<int> list(0);
   }
 }