Add virtual/mojo-loading/http/tests

Test mojo-loading feature with http/tests layout tests.

BUG=669357

Review-Url: https://codereview.chromium.org/2505933002
Cr-Commit-Position: refs/heads/master@{#435577}
diff --git a/third_party/WebKit/LayoutTests/VirtualTestSuites b/third_party/WebKit/LayoutTests/VirtualTestSuites
index 00b30bea..cf2621d 100644
--- a/third_party/WebKit/LayoutTests/VirtualTestSuites
+++ b/third_party/WebKit/LayoutTests/VirtualTestSuites
@@ -286,7 +286,7 @@
   },
   {
     "prefix": "mojo-loading",
-    "base": "http/tests/xmlhttprequest",
+    "base": "http/tests",
     "args": ["--enable-blink-features=LoadingWithMojo"]
   },
   {