Keep two empty lines between declarations for cpp files

tools/oom_dump/oom_dump.cc

 // Copyright 2010 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 90 matching lines @@
   explicit IndirectSorter(int* a) : a_(a) { }
 
   bool operator() (int i0, int i1) {
     return a_[i0] > a_[i1];
   }
 
  private:
   int* a_;
 };
 
+
 void DumpHeapStats(const char *minidump_file) {
   Minidump minidump(minidump_file);
   CHECK(minidump.Read());
 
   MinidumpException *exception = minidump.GetException();
   CHECK(exception);
 
   MinidumpContext* crash_context = exception->GetContext();
   CHECK(crash_context);
 
@@ skipping 158 matching lines @@
 int main(int argc, char **argv) {
   if (argc != 2) {
     fprintf(stderr, "usage: %s <minidump>\n", argv[0]);
     return 1;
   }
 
   DumpHeapStats(argv[1]);
 
   return 0;
 }