[ES6 modules] Fix context leak. ModuleScript should use TraceWrapperV8Reference to hold onto v8::Mo…

third_party/WebKit/Source/core/dom/ModulatorImpl.h

 // Copyright 2017 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 ModulatorImpl_h
 #define ModulatorImpl_h
 
 #include "bindings/core/v8/ScriptModule.h"
 #include "core/dom/Modulator.h"
 #include "platform/bindings/ScriptWrappable.h"
@@ skipping 25 matching lines @@
 
  private:
   // Implements Modulator
 
   ScriptModuleResolver* GetScriptModuleResolver() override {
     return script_module_resolver_.Get();
   }
   WebTaskRunner* TaskRunner() override { return task_runner_.Get(); }
   ReferrerPolicy GetReferrerPolicy() override;
   SecurityOrigin* GetSecurityOrigin() override;
+  ScriptState* GetScriptState() override { return script_state_.Get(); }
 
   void FetchTree(const ModuleScriptFetchRequest&, ModuleTreeClient*) override;
   void FetchDescendantsForInlineScript(ModuleScript*,
                                        ModuleTreeClient*) override;
   void FetchTreeInternal(const ModuleScriptFetchRequest&,
                          const AncestorList&,
                          ModuleGraphLevel,
                          ModuleTreeClient*) override;
   void FetchSingle(const ModuleScriptFetchRequest&,
                    ModuleGraphLevel,
@@ skipping 21 matching lines @@
   Member<ResourceFetcher> fetcher_;
   TraceWrapperMember<ModuleMap> map_;
   Member<ModuleScriptLoaderRegistry> loader_registry_;
   Member<ModuleTreeLinkerRegistry> tree_linker_registry_;
   Member<ScriptModuleResolver> script_module_resolver_;
 };
 
 }  // namespace blink
 
 #endif