Modify some more GC layout tests to work with Ignition

third_party/WebKit/LayoutTests/storage/indexeddb/key-cursor-request-cycle.html

Index: third_party/WebKit/LayoutTests/storage/indexeddb/key-cursor-request-cycle.html
diff --git a/third_party/WebKit/LayoutTests/storage/indexeddb/key-cursor-request-cycle.html b/third_party/WebKit/LayoutTests/storage/indexeddb/key-cursor-request-cycle.html
index 4b24ace259f4399614251f4389b773d6bbf62bfc..a0e99fa3d6e2cccd4010929da562e58807d4994b 100644
--- a/third_party/WebKit/LayoutTests/storage/indexeddb/key-cursor-request-cycle.html
+++ b/third_party/WebKit/LayoutTests/storage/indexeddb/key-cursor-request-cycle.html
@@ -70,7 +70,10 @@ function onOpen(evt)
             preamble(evt);
             shouldBeEqualToString("cursor.key", "key2");
 
-            cursorObservation = internals.observeGC(cursor);
+            // Access objects in an inner function to avoid references to
+            // objects remaining live on this function's stack frame
+            // (http://crbug.com/595672/).
+            (() => { cursorObservation = internals.observeGC(cursor); })();
             evalAndLog("cursor = null");
             evalAndLog("gc()");
             shouldBeTrue("cursorRequestObservation.wasCollected");