Keep two empty lines between declarations for cpp files

samples/lineprocessor.cc

Index: samples/lineprocessor.cc
===================================================================
--- samples/lineprocessor.cc	(revision 15486)
+++ samples/lineprocessor.cc	(working copy)
@@ -322,6 +322,7 @@
   return true;
 }
 
+
 int main(int argc, char* argv[]) {
   int result = RunMain(argc, argv);
   v8::V8::Dispose();
@@ -421,6 +422,7 @@
   args.GetReturnValue().Set(ReadLine());
 }
 
+
 v8::Handle<v8::String> ReadLine() {
   const int kBufferSize = 1024 + 1;
   char buffer[kBufferSize];