Revert of Minor changes to allow Pepper InstancePrivate tests to pass with gin

ppapi/tests/test_instance_deprecated.h

Index: ppapi/tests/test_instance_deprecated.h
diff --git a/ppapi/tests/test_instance_deprecated.h b/ppapi/tests/test_instance_deprecated.h
index 58b3efee547252e90344a29236216b1e51e9897c..dfccd138938e2b8a8b56519920a78d379fc02bee 100644
--- a/ppapi/tests/test_instance_deprecated.h
+++ b/ppapi/tests/test_instance_deprecated.h
@@ -26,10 +26,6 @@
   // happens on instance shutdown.
   void LeakReferenceAndIgnore(const pp::Var& leaked);
 
-  void set_instance_object_destroyed(bool destroyed) {
-    instance_object_destroyed_ = destroyed;
-  }
-
  protected:
   // Test case protected overrides.
   virtual pp::deprecated::ScriptableObject* CreateTestObject();
@@ -44,9 +40,6 @@
   // Value written by set_string which is called by the ScriptableObject. This
   // allows us to keep track of what was called.
   std::string string_;
-
-  // Whether the instance object for this instance has been destroyed.
-  bool instance_object_destroyed_;
 };
 
 #endif  // PPAPI_TESTS_TEST_INSTANCE_H_