Moving the WhitenessWitness back to DescriptorArray.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 65a96612b76b1e321767d05515cfa4401cee445f..36d0b6c15c5be65ccea2b5d09a3894308288fc50 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2167,14 +2167,14 @@ void DescriptorArray::SwapSortedKeys(int first, int second) {
 }
 
 
-FixedArray::WhitenessWitness::WhitenessWitness(FixedArray* array)
+DescriptorArray::WhitenessWitness::WhitenessWitness(FixedArray* array)
     : marking_(array->GetHeap()->incremental_marking()) {
   marking_->EnterNoMarkingScope();
   ASSERT(Marking::Color(array) == Marking::WHITE_OBJECT);
 }
 
 
-FixedArray::WhitenessWitness::~WhitenessWitness() {
+DescriptorArray::WhitenessWitness::~WhitenessWitness() {
   marking_->LeaveNoMarkingScope();
 }