[iwyu] Include handles.h less.

src/fast-accessor-assembler.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_FAST_ACCESSOR_ASSEMBLER_H_
 #define V8_FAST_ACCESSOR_ASSEMBLER_H_
 
 #include <stdint.h>
 #include <memory>
 #include <vector>
 
 #include "include/v8-experimental.h"
 #include "src/base/macros.h"
-#include "src/handles.h"
+#include "src/zone/zone.h"
 
 namespace v8 {
 namespace internal {
 
 class Code;
 class CodeStubAssembler;
 class Isolate;
-class Zone;
+template <typename T>
+class MaybeHandle;
 
 namespace compiler {
 class Node;
 class CodeAssemblerLabel;
 class CodeAssemblerState;
 class CodeAssemblerVariable;
 }
 
 // This interface "exports" an aggregated subset of RawMachineAssembler, for
 // use by the API to implement Fast Dom Accessors.
@@ skipping 79 matching lines @@
   // strict as this class will be exposed at the API.)
   enum { kBuilding, kBuilt, kError } state_;
 
   DISALLOW_COPY_AND_ASSIGN(FastAccessorAssembler);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FAST_ACCESSOR_ASSEMBLER_H_