CacheStorage: Add ignoreSearch option to cache.matchAll().

third_party/WebKit/LayoutTests/http/tests/cachestorage/resources/ignore-search-with-credentials-worker.js

+self.onfetch = function(e) {
+  if (!/\.txt.*/.test(e.request.url))
+    return;
+  e.respondWith(
+    self.caches.open('ignore-search')
+      .then(function(cache) {
+          return cache.add(e.request);
+        })
+      .then(function() {
+          return new Response(e.request.url);
+        })
+  );
+};