Move ScriptWrappable and dependencies to platform/bindings

third_party/WebKit/Source/bindings/core/v8/ScriptWrappableVisitorVerifier.h

 // Copyright 2016 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 ScriptWrappableVisitorVerifier_h
-#define ScriptWrappableVisitorVerifier_h
-
-#include "bindings/core/v8/ScriptWrappableVisitor.h"
-
-namespace blink {
-
-class ScriptWrappableVisitorVerifier : public WrapperVisitor {
- public:
-  void DispatchTraceWrappers(const TraceWrapperBase* t) const override {
-    t->TraceWrappers(this);
-  }
-
-  void TraceWrappers(const TraceWrapperV8Reference<v8::Value>&) const override {
-  }
-  void MarkWrapper(const v8::PersistentBase<v8::Value>*) const override {}
-
-  bool PushToMarkingDeque(
-      void (*trace_wrappers_callback)(const WrapperVisitor*, const void*),
-      HeapObjectHeader* (*heap_object_header_callback)(const void*),
-      void (*missed_write_barrier_callback)(void),
-      const void* object) const override {
-    if (!heap_object_header_callback(object)->IsWrapperHeaderMarked()) {
-      // If this branch is hit, it means that a white (not discovered by
-      // traceWrappers) object was assigned as a member to a black object
-      // (already processed by traceWrappers). Black object will not be
-      // processed anymore so White object will remain undetected and
-      // therefore its wrapper and all wrappers reachable from it would be
-      // collected.
-
-      // This means there is a write barrier missing somewhere. Check the
-      // backtrace to see which types are causing this and review all the
-      // places where white object is set to a black object.
-      missed_write_barrier_callback();
-      NOTREACHED();
-    }
-    trace_wrappers_callback(this, object);
-    return true;
-  }
-
-  bool MarkWrapperHeader(HeapObjectHeader* header) const override {
-    if (!visited_headers_.Contains(header)) {
-      visited_headers_.insert(header);
-      return true;
-    }
-    return false;
-  }
-  void MarkWrappersInAllWorlds(const ScriptWrappable*) const override {}
-
- private:
-  mutable WTF::HashSet<HeapObjectHeader*> visited_headers_;
-};
-}
-#endif
+// This file has been moved to
+// platform/bindings/ScriptWrappableVisitorVerifier.h.
+// TODO(adithyas): Remove this file.
+#include "platform/bindings/ScriptWrappableVisitorVerifier.h"