Remove V8PerIsolateData::EnsureLiveRoot.

third_party/WebKit/Source/platform/bindings/V8PerIsolateData.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 102 matching lines @@
   static void Destroy(v8::Isolate*);
   static v8::Isolate* MainThreadIsolate();
 
   static void EnableIdleTasks(v8::Isolate*,
                               std::unique_ptr<gin::V8IdleTaskRunner>);
 
   v8::Isolate* GetIsolate() { return isolate_holder_.isolate(); }
 
   StringCache* GetStringCache() { return string_cache_.get(); }
 
-  v8::Persistent<v8::Value>& EnsureLiveRoot();
-
   bool IsHandlingRecursionLevelError() const {
     return is_handling_recursion_level_error_;
   }
   void SetIsHandlingRecursionLevelError(bool value) {
     is_handling_recursion_level_error_ = value;
   }
 
   bool IsReportingException() const { return is_reporting_exception_; }
   void SetReportingException(bool value) { is_reporting_exception_ = value; }
 
@@ skipping 111 matching lines @@
   // m_operationTemplateMapFor{,Non}MainWorld holds function templates for
   // the cross-origin accessible DOM operations.
   V8FunctionTemplateMap operation_template_map_for_main_world_;
   V8FunctionTemplateMap operation_template_map_for_non_main_world_;
 
   // Contains lists of eternal names, such as dictionary keys.
   HashMap<const void*, Vector<v8::Eternal<v8::Name>>> eternal_name_cache_;
 
   std::unique_ptr<StringCache> string_cache_;
   std::unique_ptr<V8PrivateProperty> private_property_;
-  ScopedPersistent<v8::Value> live_root_;
   RefPtr<ScriptState> script_regexp_script_state_;
 
   bool constructor_mode_;
   friend class ConstructorMode;
 
   bool use_counter_disabled_;
   friend class UseCounterDisabledScope;
 
   bool is_handling_recursion_level_error_;
   bool is_reporting_exception_;
 
   Vector<std::unique_ptr<EndOfScopeTask>> end_of_scope_tasks_;
   std::unique_ptr<Data> thread_debugger_;
 
   Persistent<ActiveScriptWrappableSet> active_script_wrappables_;
   std::unique_ptr<ScriptWrappableVisitor> script_wrappable_visitor_;
 };
 
 }  // namespace blink
 
 #endif  // V8PerIsolateData_h