Make browser tests all run from a server instead of the local filesystem.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index e982e7d793157eedb4bedf089d514fdfc5f58279..19f62143cf58fac9ca92cc3c5f401b8740b003cc 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -30211,18 +30211,16 @@ class _HttpRequestUtils {
 
   // Helper for factory HttpRequest.get
   static HttpRequest get(String url,
-                            onSuccess(HttpRequest request),
+                            onComplete(HttpRequest request),
                             bool withCredentials) {
     final request = new HttpRequest();
     request.open('GET', url, true);
 
     request.withCredentials = withCredentials;
 
-    // Status 0 is for local XHR request.
     request.on.readyStateChange.add((e) {
-      if (request.readyState == HttpRequest.DONE &&
-          (request.status == 200 || request.status == 0)) {
-        onSuccess(request);
+      if (request.readyState == HttpRequest.DONE) {
+        onComplete(request);
       }
     });