Remove support for externally backed elements from the API

src/objects.h

 // Copyright 2012 the V8 project 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 V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 168 matching lines @@
   CONTEXTUAL
 };
 
 
 enum MutableMode {
   MUTABLE,
   IMMUTABLE
 };
 
 
+enum ExternalArrayType {
+  kExternalInt8Array = 1,
+  kExternalUint8Array,
+  kExternalInt16Array,
+  kExternalUint16Array,
+  kExternalInt32Array,
+  kExternalUint32Array,
+  kExternalFloat32Array,
+  kExternalFloat64Array,
+  kExternalUint8ClampedArray,
+};
+
+
 static const int kGrowICDelta = STORE_AND_GROW_NO_TRANSITION -
     STANDARD_STORE;
 STATIC_ASSERT(STANDARD_STORE == 0);
 STATIC_ASSERT(kGrowICDelta ==
               STORE_AND_GROW_TRANSITION_SMI_TO_OBJECT -
               STORE_TRANSITION_SMI_TO_OBJECT);
 STATIC_ASSERT(kGrowICDelta ==
               STORE_AND_GROW_TRANSITION_SMI_TO_DOUBLE -
               STORE_TRANSITION_SMI_TO_DOUBLE);
 STATIC_ASSERT(kGrowICDelta ==
@@ skipping 10870 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_