Minimal fix to get cross frame tests working, take #2.

tests/html/html.status

Index: tests/html/html.status
diff --git a/tests/html/html.status b/tests/html/html.status
index c85e73d19882aa3a62e058752753de997be46424..870df3c93992e3fbf26605c8b905629de533ec0c 100644
--- a/tests/html/html.status
+++ b/tests/html/html.status
@@ -27,8 +27,6 @@ request_animation_frame_test: Skip   # drt hangs
 
 [ $compiler == frog && ($runtime == drt || $runtime == ie || $runtime == safari || $runtime == ff || $runtime == chrome || $runtime == opera) ]
 window_nosuchmethod_test: Fail # Issue 1837, frog puts top-level members in the global JS namespace.
-cross_frame_test: Fail # Issue 2774, iframe.contentDocument is accessible in dart:html frog.
-inner_frame_test: Fail # Issue 2774
 
 [ $runtime == ie || $runtime == safari || $runtime == ff || $runtime == chrome || $runtime == opera || ($runtime == drt && $compiler == frog)]
 # TODO(vsm): Triage DOM tests.
@@ -152,8 +150,6 @@ dom_isolates_test: Fail # error: cannot resolve spawnDomIsolate
 request_animation_frame_test: Skip # Async test hangs.
 isolates_test: Skip   # Timeout because leg does not support web workers.
 typed_arrays_1_test: Fail # dart2js doesn't support is checks with generic types.
-cross_frame_test: Fail # Issue 2774, iframe.contentDocument is accessible in dart:html
-inner_frame_test: Fail # Issue 2774
 indexeddb_3_test: Fail  # TypeError: Object #<IDBCursorWithValue> has no method 'continueFunction'
 indexeddb_4_test: Fail  # TypeError: Object #<IDBCursorWithValue> has no method 'continueFunction'