Keep two empty lines between declarations for cpp files

src/parser.cc

Index: src/parser.cc
===================================================================
--- src/parser.cc	(revision 15486)
+++ src/parser.cc	(working copy)
@@ -371,6 +371,7 @@
   return result;
 }
 
+
 Scanner::Location ScriptDataImpl::MessageLocation() {
   int beg_pos = Read(PreparseDataConstants::kMessageStartPos);
   int end_pos = Read(PreparseDataConstants::kMessageEndPos);
@@ -3769,6 +3770,7 @@
   return isolate()->factory()->uninitialized_value();
 }
 
+
 // Validation per 11.1.5 Object Initialiser
 class ObjectLiteralPropertyChecker {
  public:
@@ -4962,6 +4964,7 @@
   return factory()->NewThrow(call_constructor, scanner().location().beg_pos);
 }
 
+
 // ----------------------------------------------------------------------------
 // Regular expressions
 
@@ -5032,6 +5035,7 @@
   return simple_;
 }
 
+
 RegExpTree* RegExpParser::ReportError(Vector<const char> message) {
   failed_ = true;
   *error_ = isolate()->factory()->NewStringFromAscii(message, NOT_TENURED);