Clean up ModuleRecordResolverImpl

Delete unnecessary function definition in ModuleRecordResolverImpl.

Change-Id: Ib9b54429487f772565222c6dbb16bd8e905cfe7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839276Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Rika Fujimaki <rikaf@google.com>
Cr-Commit-Position: refs/heads/master@{#702731}

third_party/blink/renderer/core/script/module_record_resolver_impl.h

@@ -51,8 +51,6 @@ class CORE_EXPORT ModuleRecordResolverImpl final
   // Implements ContextLifecycleObserver:
   void ContextDestroyed(ExecutionContext*) final;
 
-  v8::Local<v8::Module> GetBoxedV8ModuleFromModuleScript(const ModuleScript*);
-
   // Corresponds to the spec concept "referencingModule.[[HostDefined]]".
   // crbug.com/725816 : ModuleRecord contains strong ref to v8::Module thus we
   // should not use ModuleRecord as the map key. We currently rely on Detach()