Remove the CompositedLayerMappingPtr smart ptr.

Source/core/rendering/compositing/CompositedLayerMappingPtr.h

Index: Source/core/rendering/compositing/CompositedLayerMappingPtr.h
diff --git a/Source/core/rendering/compositing/CompositedLayerMappingPtr.h b/Source/core/rendering/compositing/CompositedLayerMappingPtr.h
deleted file mode 100644
index a380563dee829e9408511fd08e4eb2ca9b6300d7..0000000000000000000000000000000000000000
--- a/Source/core/rendering/compositing/CompositedLayerMappingPtr.h
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CompositedLayerMappingPtr_h
-#define CompositedLayerMappingPtr_h
-
-#include "wtf/Assertions.h"
-
-namespace blink {
-
-class CompositedLayerMapping;
-
-class CompositedLayerMappingPtr {
-public:
-    CompositedLayerMappingPtr(CompositedLayerMapping* mapping)
-        : m_mapping(mapping)
-    {
-    }
-
-    CompositedLayerMapping& operator*() const
-    {
-        ASSERT(m_mapping);
-        return *m_mapping;
-    }
-
-    CompositedLayerMapping* operator->() const
-    {
-        ASSERT(m_mapping);
-        return m_mapping;
-    }
-
-private:
-    CompositedLayerMapping* m_mapping;
-};
-
-} // namespace blink
-
-#endif // CompositedLayerMappingPtr_h