Updating service worker flag to enum & also fixes #362

Author: jakearchibald

fetch.bs

@@ -728,11 +728,9 @@ explicitly set <a for=/>request</a>'s
 this flag set are subject to additional processing requirements.
 
 <p>A <a for=/>request</a> has an associated
-<dfn export>skip-service-worker flag</dfn>. Unless stated otherwise it is
-unset.
-
-<p>A <a for=/>request</a> has an associated <dfn export>skip-local-service-worker flag</dfn>. Unless
-stated otherwise it is unset.
+<dfn export>use-service-workers value</dfn>, that is "<code>all</code>",
+"<code>foreign</code>", or "<code>none</code>". Unless stated otherwise it is
+"<code>all</code>".
 
 <p>A <a for=/>request</a> has an associated
 <dfn export for=request id=concept-request-initiator>initiator</dfn>, which is
@@ -2796,13 +2794,13 @@ optional <i>CORS flag</i> and <i>CORS-preflight flag</i>, run these steps:
  <li><p>Let <var>actualResponse</var> be null.
 
  <li>
-  <p>If <var>request</var>'s <a>skip-service-worker flag</a> is unset, then run these
+  <p>If <var>request</var>'s <a>use-service-workers value</a> is not "<code>none</code>", then run these
   substeps:
 
   <ol>
    <li>
     <p>If <var>request</var>'s <a for=request>client</a> is null or
-    <var>request</var>'s <a>skip-local-service-worker flag</a> is unset, then set
+    <var>request</var>'s <a>use-service-workers value</a> is "<code>all</code>", then set
     <var>response</var> to the result of invoking <a for=/>handle fetch</a> for <var>request</var>.
     [[!HTML]] [[!SW]]
 
@@ -2894,7 +2892,8 @@ optional <i>CORS flag</i> and <i>CORS-preflight flag</i>, run these steps:
 
    <li>
     <p>If <var>request</var>'s <a for=request>redirect mode</a> is
-    "<code>follow</code>", then set <var>request</var>'s <a>skip-service-worker flag</a>.
+    "<code>follow</code>", then set <var>request</var>'s <a>use-service-workers value</a> to
+    "<code>none</code>".
 
     <p class="note no-backref">Redirects coming from the network (as opposed to from a service
     worker) are not to be exposed to a service worker.
@@ -5170,7 +5169,7 @@ method, must run these steps:
 
  <li>If <var>request</var>'s <a for=request>client</a>'s
  <a for="environment settings object">global object</a> is a {{ServiceWorkerGlobalScope}} object,
- set <var>request</var>'s <a>skip-local-service-worker flag</a>.
+ set <var>request</var>'s <a>use-service-workers value</a> to "<code>foreign</code>".
 
  <li><p>Let <var>responseObject</var> be a new {{Response}} object and a new associated
  {{Headers}} object whose <a for=Headers>guard</a> is
@@ -5323,7 +5322,7 @@ therefore not shareable, a WebSocket connection is very close to identical to an
  <li><p>Let <var>request</var> be a new <a for=/>request</a>, whose
  <a for=request>url</a> is <var>requestURL</var>,
  <a for=request>client</a> is <var>client</var>,
- <a>skip-service-worker flag</a> is set,
+ <a>use-service-workers value</a> is "<code>none</code>",
  <a>synchronous flag</a> is set,
  <a for=request>mode</a> is "<code>websocket</code>",
  <a for=request>credentials mode</a> is