[heap] Remove obsolete constructors from SemiSpaceIterator.

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index f9eeaad0fca4df8a761ad1d1acba3ffc13451a30..db35126ad0f19dc7ed49cd7ea31d23c474069db2 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -3657,8 +3657,7 @@ void MarkCompactCollector::EvacuateNewSpaceAndCandidates() {
     GCTracer::Scope gc_scope(heap()->tracer(),
                              GCTracer::Scope::MC_UPDATE_NEW_TO_NEW_POINTERS);
     // Update pointers in to space.
-    SemiSpaceIterator to_it(heap()->new_space()->bottom(),
-                            heap()->new_space()->top());
+    SemiSpaceIterator to_it(heap()->new_space());
     for (HeapObject* object = to_it.Next(); object != NULL;
          object = to_it.Next()) {
       Map* map = object->map();