platform apps: Disables history.pushState/replaceState in platform_app.js.

chrome/test/data/extensions/platform_apps/restrictions/main.js

Index: chrome/test/data/extensions/platform_apps/restrictions/main.js
diff --git a/chrome/test/data/extensions/platform_apps/restrictions/main.js b/chrome/test/data/extensions/platform_apps/restrictions/main.js
index cca22626a9b134f0b6db2475f74323f71ff1ca4f..f566039e5c1cd44da87e491f062f82214ff9ef2d 100644
--- a/chrome/test/data/extensions/platform_apps/restrictions/main.js
+++ b/chrome/test/data/extensions/platform_apps/restrictions/main.js
@@ -67,13 +67,9 @@ chrome.test.runTests([
     assertEq('undefined', typeof(history.forward));
     assertEq('undefined', typeof(history.go));
     assertEq('undefined', typeof(history.length));
-
-    // These are part of the HTML5 History API that are feature detected, so we
-    // remove them altogether, allowing apps to have fallback behavior.
-    chrome.test.assertFalse('pushState' in history);
-    chrome.test.assertFalse('replaceState' in history);
-    chrome.test.assertFalse('state' in history);
-
+    assertEq('undefined', typeof(history.pushState));
+    assertEq('undefined', typeof(history.replaceState));
+    assertEq('undefined', typeof(history.state));
     succeed();
   },