Revert trunk to version 3.16.4.

src/list.h

Index: src/list.h
diff --git a/src/list.h b/src/list.h
index 43d982f687a7b37bfe55a128f47e9e8ee8c12eea..7fd4f5cd2d6f6af7b8e2675252347b560c95dbdd 100644
--- a/src/list.h
+++ b/src/list.h
@@ -149,9 +149,6 @@ class List {
   // 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;