blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/dom/custom/CustomElementDefinitionBuilder.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 CustomElementDefinitionBuilder_h
 #define CustomElementDefinitionBuilder_h
 
 #include "core/CoreExport.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class CustomElementDefinition;
 class CustomElementDescriptor;
 class CustomElementRegistry;
-class ExceptionState;
-class ScriptState;
-class ScriptValue;
 
 // Implement CustomElementDefinitionBuilder to provide
 // technology-specific steps for CustomElementRegistry.define.
 // https://html.spec.whatwg.org/multipage/scripting.html#dom-customelementsregistry-define
 class CORE_EXPORT CustomElementDefinitionBuilder {
   STACK_ALLOCATED();
   WTF_MAKE_NONCOPYABLE(CustomElementDefinitionBuilder);
 
  public:
   CustomElementDefinitionBuilder() {}
@@ skipping 18 matching lines @@
   // should not proceed.
   virtual bool rememberOriginalProperties() = 0;
 
   // Produce the definition. This must produce a definition.
   virtual CustomElementDefinition* build(const CustomElementDescriptor&) = 0;
 };
 
 }  // namespace blink
 
 #endif  // CustomElementDefinitionBuilder_h