Fixes tests that use internals.observeGC to work with Ignition.

third_party/WebKit/LayoutTests/editing/input/text-input-controller-leak-document.html

Index: third_party/WebKit/LayoutTests/editing/input/text-input-controller-leak-document.html
diff --git a/third_party/WebKit/LayoutTests/editing/input/text-input-controller-leak-document.html b/third_party/WebKit/LayoutTests/editing/input/text-input-controller-leak-document.html
index 06e65c066f443b795aa844588804f375c755b69a..cc74c3d30184c09eba48f2dfcb50b61a9ce1ce82 100644
--- a/third_party/WebKit/LayoutTests/editing/input/text-input-controller-leak-document.html
+++ b/third_party/WebKit/LayoutTests/editing/input/text-input-controller-leak-document.html
@@ -7,9 +7,19 @@
         var input = document.getElementById('text');
         input.focus();
         textInputController.setMarkedText("hello", 0, 5);
-        var markedRangeResultGC = internals.observeGC(textInputController.markedRange());
-        var selectedRangeResultGC = internals.observeGC(textInputController.selectedRange());
-        var firstRectForCharacterRangeGC = internals.observeGC(textInputController.firstRectForCharacterRange(0, 0));
+        // Do not pass the object directly to observeGC function. This may
+        // remain live on this function's stack preventing GC from collecting
+        // it. Accessing the object inside an inner function will prevent any
+        // unneeded references on this function's stack.
+        var markedRangeResultGC = internals.observeGC((() => {
+                return textInputController.markedRange();
+            })());
+        var selectedRangeResultGC = internals.observeGC((() => {
+                return textInputController.selectedRange();
+            })());
+        var firstRectForCharacterRangeGC = internals.observeGC((() => {
+                return textInputController.firstRectForCharacterRange(0, 0);
+            })());
         gc();
         shouldBeTrue('markedRangeResultGC.wasCollected');
         shouldBeTrue('selectedRangeResultGC.wasCollected');