Remove redundant serviceworker/cache-* tests

LayoutTests/http/tests/serviceworker/resources/cache-storage-keys-worker.js

Index: LayoutTests/http/tests/serviceworker/resources/cache-storage-keys-worker.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/cache-storage-keys-worker.js b/LayoutTests/http/tests/serviceworker/resources/cache-storage-keys-worker.js
deleted file mode 100644
index 80840a0c4c94fbe99b26998b61638fc002430c08..0000000000000000000000000000000000000000
--- a/LayoutTests/http/tests/serviceworker/resources/cache-storage-keys-worker.js
+++ /dev/null
@@ -1,32 +0,0 @@
-importScripts('worker-testharness.js');
-importScripts('../../resources/testharness-helpers.js');
-importScripts('override_assert_object_equals.js');
-
-var test_cache_list =
-  ['', 'example', 'Another cache name', 'A', 'a', 'ex ample'];
-
-promise_test(function(test) {
-    return self.caches.keys()
-      .then(function(keys) {
-          assert_true(Array.isArray(keys),
-                      'CacheStorage.keys should return an Array.');
-          return Promise.all(keys.map(function(key) {
-              return self.caches.delete(key);
-            }));
-        })
-      .then(function() {
-          return Promise.all(test_cache_list.map(function(key) {
-              return self.caches.open(key);
-            }));
-        })
-
-      .then(function() { return self.caches.keys(); })
-      .then(function(keys) {
-          assert_true(Array.isArray(keys),
-                      'CacheStorage.keys should return an Array.');
-          assert_array_equals(keys,
-                              test_cache_list,
-                              'CacheStorage.keys should only return ' +
-                              'existing caches.');
-        });
-  }, 'CacheStorage keys');