Fix crashes in AutomationInternalCustomBindings due to no v8 context.

chrome/renderer/extensions/automation_internal_custom_bindings.h

Index: chrome/renderer/extensions/automation_internal_custom_bindings.h
diff --git a/chrome/renderer/extensions/automation_internal_custom_bindings.h b/chrome/renderer/extensions/automation_internal_custom_bindings.h
index d2639942a785f7659b59f5923c9c1e74f70213a9..5be7c9d250c7336dfdf28f34c761e694672e233d 100644
--- a/chrome/renderer/extensions/automation_internal_custom_bindings.h
+++ b/chrome/renderer/extensions/automation_internal_custom_bindings.h
@@ -47,6 +47,9 @@ class AutomationInternalCustomBindings : public ObjectBackedNativeHandler,
   }
 
  private:
+  // ObjectBackedNativeHandler overrides:
+  void Invalidate() override;
+
   // Returns whether this extension has the "interact" permission set (either
   // explicitly or implicitly after manifest parsing).
   void IsInteractPermitted(const v8::FunctionCallbackInfo<v8::Value>& args);