[heap] Remove obsolete constructors from SemiSpaceIterator.

R=mlippautz@chromium.org

Review URL: https://codereview.chromium.org/1284643003

Cr-Commit-Position: refs/heads/master@{#30090}

src/heap/mark-compact.cc

@@ -3622,8 +3622,7 @@ 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();

src/heap/spaces.cc

@@ -1846,21 +1846,12 @@ void SemiSpace::AssertValidRange(Address start, Address end) {
 
 // -----------------------------------------------------------------------------
 // SemiSpaceIterator implementation.
+
 SemiSpaceIterator::SemiSpaceIterator(NewSpace* space) {
   Initialize(space->bottom(), space->top());
 }
 
 
-SemiSpaceIterator::SemiSpaceIterator(NewSpace* space, Address start) {
-  Initialize(start, space->top());
-}
-
-
-SemiSpaceIterator::SemiSpaceIterator(Address from, Address to) {
-  Initialize(from, to);
-}
-
-
 void SemiSpaceIterator::Initialize(Address start, Address end) {
   SemiSpace::AssertValidRange(start, end);
   current_ = start;

src/heap/spaces.h

@@ -2274,16 +2274,8 @@ class SemiSpace : public Space {
 // iterator is created are not iterated.
 class SemiSpaceIterator : public ObjectIterator {
  public:
-  // Create an iterator over the objects in the given space.  If no start
-  // address is given, the iterator starts from the bottom of the space.
-
-  // Iterate over all of allocated to-space.
+  // Create an iterator over the allocated objects in the given to-space.
   explicit SemiSpaceIterator(NewSpace* space);
-  // Iterate over part of allocated to-space, from start to the end
-  // of allocation.
-  SemiSpaceIterator(NewSpace* space, Address start);
-  // Iterate from one address to another in the same semi-space.
-  SemiSpaceIterator(Address from, Address to);
 
   HeapObject* Next() {
     if (current_ == limit_) return NULL;