Migrate WTF::LinkedHashSet/ListHashSet::last() to ::back()

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 3579 matching lines @@
     }
   }
 }
 
 void LayoutBlockFlow::removeFloatingObjectsBelow(FloatingObject* lastFloat,
                                                  LayoutUnit logicalOffset) {
   if (!containsFloats())
     return;
 
   const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
-  FloatingObject* curr = floatingObjectSet.last().get();
+  FloatingObject* curr = floatingObjectSet.back().get();
   while (curr != lastFloat &&
          (!curr->isPlaced() || logicalTopForFloat(*curr) >= logicalOffset)) {
     m_floatingObjects->remove(curr);
     if (floatingObjectSet.isEmpty())
       break;
-    curr = floatingObjectSet.last().get();
+    curr = floatingObjectSet.back().get();
   }
 }
 
 bool LayoutBlockFlow::placeNewFloats(LayoutUnit logicalTopMarginEdge,
                                      LineWidth* width) {
   if (!m_floatingObjects)
     return false;
 
   const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
   if (floatingObjectSet.isEmpty())
     return false;
 
   // If all floats have already been positioned, then we have no work to do.
-  if (floatingObjectSet.last()->isPlaced())
+  if (floatingObjectSet.back()->isPlaced())
     return false;
 
   // Move backwards through our floating object list until we find a float that
   // has already been positioned. Then we'll be able to move forward,
   // positioning all of the new floats that need it.
   FloatingObjectSetIterator it = floatingObjectSet.end();
   --it;  // Go to last item.
   FloatingObjectSetIterator begin = floatingObjectSet.begin();
   FloatingObject* lastPlacedFloatingObject = nullptr;
   while (it != begin) {
@@ skipping 974 matching lines @@
   return LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState);
 }
 
 void LayoutBlockFlow::invalidateDisplayItemClients(
     PaintInvalidationReason invalidationReason) const {
   BlockFlowPaintInvalidator(*this).invalidateDisplayItemClients(
       invalidationReason);
 }
 
 }  // namespace blink