Oilpan: Remove unused methods from HeapDeque

Source/platform/heap/HeapAllocator.h

Index: Source/platform/heap/HeapAllocator.h
diff --git a/Source/platform/heap/HeapAllocator.h b/Source/platform/heap/HeapAllocator.h
index b328dbdc593ca4ae56e561fbd74c8143c0252dd9..a79b34c1776101e2eea258e7d1564f937ee3c3ec 100644
--- a/Source/platform/heap/HeapAllocator.h
+++ b/Source/platform/heap/HeapAllocator.h
@@ -408,27 +408,15 @@ public:
     HeapDeque<T, 0>& operator=(const HeapDeque& other)
     {
         HeapDeque<T> copy(other);
-        swap(copy);
+        Deque<T, inlineCapacity, HeapAllocator>::swap(copy);
         return *this;
     }
 
-    // FIXME: Doesn't work if there is an inline buffer, due to crbug.com/360572
-    void swap(HeapDeque& other)
-    {
-        Deque<T, inlineCapacity, HeapAllocator>::swap(other);
-    }
-
     template<size_t otherCapacity>
     HeapDeque(const HeapDeque<T, otherCapacity>& other)
         : Deque<T, inlineCapacity, HeapAllocator>(other)
     {
     }
-
-    template<typename U>
-    void append(const U& other)
-    {
-        Deque<T, inlineCapacity, HeapAllocator>::append(other);
-    }
 };
 
 template<typename T, size_t i>