Cache Storage API tests: Fix WPT test bugs, remove redundant local copies

third_party/WebKit/LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js

Index: third_party/WebKit/LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js b/third_party/WebKit/LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js
deleted file mode 100644
index ef06ccdff5c8df29c2aefb5d11c4d3dfcf493bf6..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js
+++ /dev/null
@@ -1,35 +0,0 @@
-if (self.importScripts) {
-    importScripts('/resources/testharness.js');
-    importScripts('../resources/test-helpers.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');
-
-done();