Keep two empty lines between declarations for cpp files

src/incremental-marking.cc

 // Copyright 2012 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 545 matching lines @@
   if (!marking_deque_memory_committed_) {
     bool success = marking_deque_memory_->Commit(
         reinterpret_cast<Address>(marking_deque_memory_->address()),
         marking_deque_memory_->size(),
         false);  // Not executable.
     CHECK(success);
     marking_deque_memory_committed_ = true;
   }
 }
 
+
 void IncrementalMarking::UncommitMarkingDeque() {
   if (state_ == STOPPED && marking_deque_memory_committed_) {
     bool success = marking_deque_memory_->Uncommit(
         reinterpret_cast<Address>(marking_deque_memory_->address()),
         marking_deque_memory_->size());
     CHECK(success);
     marking_deque_memory_committed_ = false;
   }
 }
 
@@ skipping 455 matching lines @@
   bytes_scanned_ = 0;
   write_barriers_invoked_since_last_step_ = 0;
 }
 
 
 int64_t IncrementalMarking::SpaceLeftInOldSpace() {
   return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSizeOfObjects();
 }
 
 } }  // namespace v8::internal