Keep two empty lines between declarations for cpp files

src/log.cc

Index: src/log.cc
===================================================================
--- src/log.cc	(revision 15486)
+++ src/log.cc	(working copy)
@@ -491,6 +491,7 @@
   code_event_handler_(&event);
 }
 
+
 void* Logger::IssueStartCodePosInfoEvent() {
   JitCodeEvent event;
   memset(&event, 0, sizeof(event));
@@ -500,6 +501,7 @@
   return event.user_data;
 }
 
+
 void Logger::IssueEndCodePosInfoEvent(Code* code, void* jit_handler_data) {
   JitCodeEvent event;
   memset(&event, 0, sizeof(event));
@@ -828,6 +830,7 @@
   ApiEvent("api,%s,\"%s\",%u\n", tag, *class_name, index);
 }
 
+
 void Logger::ApiObjectAccess(const char* tag, JSObject* object) {
   if (!log_->IsEnabled() || !FLAG_log_api) return;
   String* class_name_obj = object->class_name();
@@ -1206,6 +1209,7 @@
   }
 }
 
+
 void Logger::CodeStartLinePosInfoRecordEvent(PositionsRecorder* pos_recorder) {
   if (code_event_handler_ != NULL) {
       pos_recorder->AttachJITHandlerData(IssueStartCodePosInfoEvent());
@@ -1219,6 +1223,7 @@
   }
 }
 
+
 void Logger::SnapshotPositionEvent(Address addr, int pos) {
   if (!log_->IsEnabled()) return;
   if (FLAG_ll_prof) LowLevelSnapshotPositionEvent(addr, pos);