Update a couple more tests for load completion definition change

LayoutTests/fast/hidpi/resources/srcset-helper.js

Index: LayoutTests/fast/hidpi/resources/srcset-helper.js
diff --git a/LayoutTests/fast/hidpi/resources/srcset-helper.js b/LayoutTests/fast/hidpi/resources/srcset-helper.js
index 6c8182e3ce8a1458a39634313f412803b6864b38..ca2911f3fa84e5518b5e31bd96bf366f59df5c75 100644
--- a/LayoutTests/fast/hidpi/resources/srcset-helper.js
+++ b/LayoutTests/fast/hidpi/resources/srcset-helper.js
@@ -13,8 +13,11 @@ function runTest() {
     if (sessionStorage.pageReloaded && sessionStorage.scaleFactorIsSet) {
         delete sessionStorage.pageReloaded;
         delete sessionStorage.scaleFactorIsSet;
-        if (!window.manualNotifyDone)
-            testRunner.notifyDone();
+        if (!window.manualNotifyDone) {
+            setTimeout(function() {
+                testRunner.notifyDone();
+            }, 0);
+        }
     } else {
         // Right now there is a bug that srcset does not properly deal with dynamic changes to the scale factor,
         // so to work around that, we must reload the page to get the new image.