Revert trunk to version 3.16.4.

src/list.h

 // Copyright 2011 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 131 matching lines @@
   // Clears the list by setting the length to zero. Even if T is a
   // pointer type, clearing the list doesn't delete the entries.
   INLINE(void Clear());
 
   // Drops all but the first 'pos' elements from the list.
   INLINE(void Rewind(int pos));
 
   // Drop the last 'count' elements from the list.
   INLINE(void RewindBy(int count)) { Rewind(length_ - count); }
 
-  // Halve the capacity if fill level is less than a quarter.
-  INLINE(void Trim(AllocationPolicy allocator = AllocationPolicy()));
-
   bool Contains(const T& elm) const;
   int CountOccurrences(const T& elm, int start, int end) const;
 
   // Iterate through all list entries, starting at index 0.
   void Iterate(void (*callback)(T* x));
   template<class Visitor>
   void Iterate(Visitor* visitor);
 
   // Sort all list entries (using QuickSort)
   void Sort(int (*cmp)(const T* x, const T* y));
@@ skipping 44 matching lines @@
 template <typename T, class P>
 int SortedListBSearch(const List<T>& list, P cmp);
 template <typename T>
 int SortedListBSearch(const List<T>& list, T elem);
 
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LIST_H_