[iwyu] runtime.h doesn't need objects.h

src/objects.h

 // Copyright 2015 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 <memory>
 
@@ skipping 170 matching lines @@
   STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS,
   STORE_NO_TRANSITION_HANDLE_COW
 };
 
 enum MutableMode {
   MUTABLE,
   IMMUTABLE
 };
 
 
-enum ExternalArrayType {
-  kExternalInt8Array = 1,
-  kExternalUint8Array,
-  kExternalInt16Array,
-  kExternalUint16Array,
-  kExternalInt32Array,
-  kExternalUint32Array,
-  kExternalFloat32Array,
-  kExternalFloat64Array,
-  kExternalUint8ClampedArray,
-};
-
-
 static inline bool IsTransitionStoreMode(KeyedAccessStoreMode store_mode) {
   return store_mode == STORE_TRANSITION_TO_OBJECT ||
          store_mode == STORE_TRANSITION_TO_DOUBLE ||
          store_mode == STORE_AND_GROW_TRANSITION_TO_OBJECT ||
          store_mode == STORE_AND_GROW_TRANSITION_TO_DOUBLE;
 }
 
 
 static inline KeyedAccessStoreMode GetNonTransitioningStoreMode(
     KeyedAccessStoreMode store_mode) {
@@ skipping 11408 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_