Eliminate dominator and retained_size fields. They are calculating on front-end side.

src/profile-generator-inl.h

Index: src/profile-generator-inl.h
diff --git a/src/profile-generator-inl.h b/src/profile-generator-inl.h
index 9afc52fa080a37d1daf91b130701854c125086b4..6c64350e8d149c5836829b70626970c47798cf11 100644
--- a/src/profile-generator-inl.h
+++ b/src/profile-generator-inl.h
@@ -118,32 +118,12 @@ int HeapEntry::set_children_index(int index) {
 }
 
 
-int HeapEntry::set_retainers_index(int index) {
-  retainers_index_ = index;
-  int next_index = index + retainers_count_;
-  retainers_count_ = 0;
-  return next_index;
-}
-
-
 HeapGraphEdge** HeapEntry::children_arr() {
   ASSERT(children_index_ >= 0);
   return &snapshot_->children()[children_index_];
 }
 
 
-HeapGraphEdge** HeapEntry::retainers_arr() {
-  ASSERT(retainers_index_ >= 0);
-  return &snapshot_->retainers()[retainers_index_];
-}
-
-
-HeapEntry* HeapEntry::dominator() const {
-  ASSERT(dominator_ >= 0);
-  return &snapshot_->entries()[dominator_];
-}
-
-
 SnapshotObjectId HeapObjectsMap::GetNthGcSubrootId(int delta) {
   return kGcRootsFirstSubrootId + delta * kObjectIdStep;
 }