Keep two empty lines between declarations for cpp files

src/profile-generator.cc

Index: src/profile-generator.cc
===================================================================
--- src/profile-generator.cc	(revision 15486)
+++ src/profile-generator.cc	(working copy)
@@ -397,6 +397,7 @@
   int security_token_id_;
 };
 
+
 void ProfileTree::FilteredClone(ProfileTree* src, int security_token_id) {
   ms_to_ticks_scale_ = src->ms_to_ticks_scale_;
   FilteredCloneCallback cb(root_, security_token_id);
@@ -612,10 +613,12 @@
   delete *entry_ptr;
 }
 
+
 static void DeleteCpuProfile(CpuProfile** profile_ptr) {
   delete *profile_ptr;
 }
 
+
 static void DeleteProfilesList(List<CpuProfile*>** list_ptr) {
   if (*list_ptr != NULL) {
     (*list_ptr)->Iterate(DeleteCpuProfile);
@@ -623,6 +626,7 @@
   }
 }
 
+
 CpuProfilesCollection::~CpuProfilesCollection() {
   delete current_profiles_semaphore_;
   current_profiles_.Iterate(DeleteCpuProfile);