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

third_party/WebKit/LayoutTests/external/wpt/service-workers/cache-storage/resources/test-helpers.js

Index: third_party/WebKit/LayoutTests/external/wpt/service-workers/cache-storage/resources/test-helpers.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/service-workers/cache-storage/resources/test-helpers.js b/third_party/WebKit/LayoutTests/external/wpt/service-workers/cache-storage/resources/test-helpers.js
index d3b81094219780ec3033fff35d03d5b12d2d32a0..6bc3a8685726d97d492cc41e97a657949820949d 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/service-workers/cache-storage/resources/test-helpers.js
+++ b/third_party/WebKit/LayoutTests/external/wpt/service-workers/cache-storage/resources/test-helpers.js
@@ -236,6 +236,30 @@ function assert_response_in_array(actual, expected_array, description) {
     }), description);
 }
 
+// Helper for testing with Request objects. Compares simple
+// attributes defined on the interfaces, as well as the headers.
+function assert_request_equals(actual, expected, description) {
+    assert_class_string(actual, "Request", description);
+    ["url"].forEach(function(attribute) {
+        assert_equals(actual[attribute], expected[attribute],
+                      description + " Attributes differ: " + attribute + ".");
+    });
+    assert_header_equals(actual.headers, expected.headers, description);
+}
+
+// Asserts that two arrays |actual| and |expected| contain the same
+// set of Requests as determined by assert_request_equals(). The
+// corresponding elements must occupy corresponding indices in their
+// respective arrays.
+function assert_request_array_equals(actual, expected, description) {
+    assert_true(Array.isArray(actual), description);
+    assert_equals(actual.length, expected.length, description);
+    actual.forEach(function(value, index) {
+        assert_request_equals(value, expected[index],
+                              description + " : object[" + index + "]");
+    });
+}
+
 // Deletes all caches, returning a promise indicating success.
 function delete_all_caches() {
   return self.caches.keys()