Modify some gc related layout tests 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 cc74c3d30184c09eba48f2dfcb50b61a9ce1ce82..059030ea580fb0f8d3e58ef64c2eca27672be68e 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
@@ -6,20 +6,21 @@
     <script>
         var input = document.getElementById('text');
         input.focus();
-        textInputController.setMarkedText("hello", 0, 5);
-        // 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);
-            })());
+        // Do initialization work in an inner function to avoid references to
+        // objects remaining live on this function's stack frame.
+        // (http://crbug.com/595672/).
+        var markedRangeResultGC, selectedRangeResultGC,
+            firstRectForCharacterRangeGC;
+        (function() {
+            textInputController.setMarkedText("hello", 0, 5);

[rmcilroy, 2016/05/23 12:31:17]

I was meaning all the initialization code (e.g., getting the input element and
focusing on it too

[mythria, 2016/05/23 13:38:10]

Done.

+            markedRangeResultGC = internals.observeGC(
+                textInputController.markedRange());
+            selectedRangeResultGC = internals.observeGC(
+                textInputController.selectedRange());
+            firstRectForCharacterRangeGC = internals.observeGC(
+                textInputController.firstRectForCharacterRange(0, 0));
+        })();
+
         gc();
         shouldBeTrue('markedRangeResultGC.wasCollected');
         shouldBeTrue('selectedRangeResultGC.wasCollected');