Ensure that Vector destruction always clears the buffer pointer.

Source/wtf/Deque.h

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 15 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WTF_Deque_h
 #define WTF_Deque_h
 
 // FIXME: Could move what Vector and Deque share into a separate file.
 // Deque doesn't actually use Vector.
 
-#include <iterator>
 #include "wtf/PassTraits.h"
 #include "wtf/Vector.h"
+#include <iterator>
 
 namespace WTF {
 
     template<typename T, size_t inlineCapacity> class DequeIteratorBase;
     template<typename T, size_t inlineCapacity> class DequeIterator;
     template<typename T, size_t inlineCapacity> class DequeConstIterator;
 
     template<typename T, size_t inlineCapacity = 0>
     class Deque {
         WTF_MAKE_FAST_ALLOCATED;
@@ skipping 293 matching lines @@
 
     template<typename T, size_t inlineCapacity>
     inline void Deque<T, inlineCapacity>::clear()
     {
         checkValidity();
         invalidateIterators();
         destroyAll();
         m_start = 0;
         m_end = 0;
         m_buffer.deallocateBuffer(m_buffer.buffer());
+        m_buffer.clearBufferPointer();
         checkValidity();
     }
 
     template<typename T, size_t inlineCapacity>
     template<typename Predicate>
     inline DequeIterator<T, inlineCapacity> Deque<T, inlineCapacity>::findIf(Predicate& predicate)
     {
         iterator end_iterator = end();
         for (iterator it = begin(); it != end_iterator; ++it) {
             if (predicate(*it))
@@ skipping 276 matching lines @@
         if (!m_index)
             return &m_deque->m_buffer.buffer()[m_deque->m_buffer.capacity() - 1];
         return &m_deque->m_buffer.buffer()[m_index - 1];
     }
 
 } // namespace WTF
 
 using WTF::Deque;
 
 #endif // WTF_Deque_h