[wakelock] Only expose in workers when system locks are enabled

This is a follow-up to r746546 which uses the new SystemWakeLock feature
flag to only enable the wake lock interface in dedicated workers when
system wake locks are enabled. Screen wake locks are not supported in
workers.

Bug: 257511
Change-Id: I3c4147b7e40621b11a11d9676c4201c62f9e495f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090722
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749963}

third_party/blink/renderer/modules/wake_lock/wake_lock.idl

@@ -10,8 +10,7 @@ enum WakeLockType {
 // https://w3c.github.io/wake-lock/#the-wakelock-interface
 [
   SecureContext,
-  Exposed=(DedicatedWorker,Window),
-  RuntimeEnabled=WakeLock
+  Exposed(DedicatedWorker SystemWakeLock, Window WakeLock)
 ] interface WakeLock {
   [CallWith=ScriptState, RaisesException] Promise<WakeLockSentinel> request(WakeLockType type);
 };

third_party/blink/renderer/modules/wake_lock/wake_lock_sentinel.idl

@@ -6,8 +6,7 @@
 
 [
   ActiveScriptWrappable,
-  Exposed=(DedicatedWorker,Window),
-  RuntimeEnabled=WakeLock,
+  Exposed(DedicatedWorker SystemWakeLock, Window WakeLock),
   SecureContext
 ] interface WakeLockSentinel : EventTarget {
   attribute EventHandler onrelease;

third_party/blink/renderer/modules/wake_lock/worker_navigator_wake_lock.idl

@@ -6,7 +6,7 @@
 
 [
   ImplementedAs=WorkerNavigatorWakeLock,
-  RuntimeEnabled=WakeLock,
+  RuntimeEnabled=SystemWakeLock,
   SecureContext
 ] partial interface WorkerNavigator {
   [CallWith=ScriptState, SameObject] readonly attribute WakeLock wakeLock;