Move IDLs to 39 roll

modules/serviceworkers/ExtendableEvent.idl

Index: modules/serviceworkers/ExtendableEvent.idl
diff --git a/modules/serviceworkers/InstallPhaseEvent.idl b/modules/serviceworkers/ExtendableEvent.idl
similarity index 95%
rename from modules/serviceworkers/InstallPhaseEvent.idl
rename to modules/serviceworkers/ExtendableEvent.idl
index 9f2637f9c56bb4755d550f75de92f778720a8d5d..c6a2b5f31c1c858fd02c831a2da2d3450df5cb08 100644
--- a/modules/serviceworkers/InstallPhaseEvent.idl
+++ b/modules/serviceworkers/ExtendableEvent.idl
@@ -28,10 +28,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#install-phase-event-interface
+// https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#extendable-event-interface
 [
     RuntimeEnabled=ServiceWorker,
     Exposed=ServiceWorker,
-] interface InstallPhaseEvent : Event {
+] interface ExtendableEvent : Event {
     [CallWith=ScriptState] void waitUntil(any value);
 };