Remove ?cacheBlocker param from HttpRequestDataReader.

This allows browsers to cache requests across page reloads.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=140903353
diff --git a/lib/src/http_request_data_reader.dart b/lib/src/http_request_data_reader.dart
index 7b0407e..2a24aa2 100644
--- a/lib/src/http_request_data_reader.dart
+++ b/lib/src/http_request_data_reader.dart
@@ -18,12 +18,9 @@
   HttpRequestDataReader(this.url);
 
   Future read(String locale) {
-    // TODO(alanknight): Remove this once it's not necessary for Chrome.
-    // Without it, the tests will be flaky on Chrome. Issue 11834.
-    var someNumber = new DateTime.now().millisecondsSinceEpoch;
     var request = new HttpRequest();
     request.timeout = 5000;
-    return _getString('$url$locale.json?cacheBlocker=$someNumber', request)
+    return _getString('$url$locale.json', request)
         .then((r) => r.responseText);
   }