ui: Cleanup class/struct forward declarations

ppapi/cpp/private/var_private.h

Index: ppapi/cpp/private/var_private.h
diff --git a/ppapi/cpp/private/var_private.h b/ppapi/cpp/private/var_private.h
index 63522ca00d39b795f5e39802cb3cb9953d3fc7c9..b7d95b263651902dc6276767ca4166bc05809aae 100644
--- a/ppapi/cpp/private/var_private.h
+++ b/ppapi/cpp/private/var_private.h
@@ -116,7 +116,7 @@ class VarPrivate : public Var {
 
  private:
   // Prevent an arbitrary pointer argument from being implicitly converted to
-  // a bool at Var construction. If somebody makes such a mistake, (s)he will
+  // a bool at Var construction. If somebody makes such a mistake, they will
   // get a compilation error.
   VarPrivate(void* non_scriptable_object_pointer);
 };