Keep two empty lines between declarations for cpp files

src/objects-debug.cc

Index: src/objects-debug.cc
===================================================================
--- src/objects-debug.cc	(revision 15486)
+++ src/objects-debug.cc	(working copy)
@@ -755,6 +755,7 @@
   VerifyPointer(construct_trap());
 }
 
+
 void JSArrayBuffer::JSArrayBufferVerify() {
   CHECK(IsJSArrayBuffer());
   JSObjectVerify();
@@ -875,6 +876,7 @@
   VerifyPointer(property_list());
 }
 
+
 void FunctionTemplateInfo::FunctionTemplateInfoVerify() {
   CHECK(IsFunctionTemplateInfo());
   TemplateInfoVerify();
@@ -1070,6 +1072,7 @@
   number_of_slow_unused_elements_ = 0;
 }
 
+
 void JSObject::SpillInformation::Print() {
   PrintF("\n  JSObject Spill Statistics (#%d):\n", number_of_objects_);