Keep two empty lines between declarations for cpp files

src/factory.cc

Index: src/factory.cc
===================================================================
--- src/factory.cc	(revision 15486)
+++ src/factory.cc	(working copy)
@@ -178,6 +178,7 @@
                      String);
 }
 
+
 // Internalized strings are created in the old generation (data space).
 Handle<String> Factory::InternalizeString(Handle<String> string) {
   CALL_HEAP_FUNCTION(isolate(),
@@ -185,6 +186,7 @@
                      String);
 }
 
+
 Handle<String> Factory::InternalizeOneByteString(Vector<const uint8_t> string) {
   CALL_HEAP_FUNCTION(isolate(),
                      isolate()->heap()->InternalizeOneByteString(string),
@@ -1235,6 +1237,7 @@
                      JSMessageObject);
 }
 
+
 Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(Handle<String> name) {
   CALL_HEAP_FUNCTION(isolate(),
                      isolate()->heap()->AllocateSharedFunctionInfo(*name),