Check for warnings when loading extensions in browser tests.

chrome/test/data/extensions/api_test/webnavigation/test_failures.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-function runTests() {
+onload = function() {
   var getURL = chrome.extension.getURL;
   chrome.tabs.create({"url": "about:blank"}, function(tab) {
     var tabId = tab.id;
 
     chrome.test.runTests([
-      // Navigates to a non-existant page.
-      function nonExistant() {
-        expect([
-          { label: "onBeforeNavigate",
-            event: "onBeforeNavigate",
-            details: { frameId: 0,
-                       processId: 0,
-                       tabId: 0,
-                       timeStamp: 0,
-                       url: getURL('failures/nonexistant.html') }},
-          { label: "onErrorOccurred",
-            event: "onErrorOccurred",
-            details: { error: "net::ERR_FILE_NOT_FOUND",
-                       frameId: 0,
-                       processId: 0,
-                       tabId: 0,
-                       timeStamp: 0,
-                       url: getURL('failures/nonexistant.html') }}],
-          [["onBeforeNavigate", "onErrorOccurred"]]);
-        chrome.tabs.update(tabId, { url: getURL('failures/nonexistant.html') });
-      },
-
-      // An page that tries to load an non-existant iframe.
-      function nonExistantIframe() {
+      // An page that tries to load an non-existent iframe.
+      function nonExistentIframe() {
         expect([
           { label: "a-onBeforeNavigate",
             event: "onBeforeNavigate",
             details: { frameId: 0,
                        processId: 0,
                        tabId: 0,
                        timeStamp: 0,
                        url: getURL('failures/d.html') }},
           { label: "a-onCommitted",
             event: "onCommitted",
@@ skipping 32 matching lines @@
                        processId: 0,
                        tabId: 0,
                        timeStamp: 0,
                        url: getURL('failures/c.html') }}],
           [navigationOrder("a-"),
             ["a-onCommitted", "b-onBeforeNavigate", "b-onErrorOccurred",
              "a-onCompleted"]]);
         chrome.tabs.update(tabId, { url: getURL('failures/d.html') });
       },
 
-      // An iframe navigates to a non-existant page.
-      function nonExistantIframeNavigation() {
+      // An iframe navigates to a non-existent page.
+      function nonExistentIframeNavigation() {
         expect([
           { label: "a-onBeforeNavigate",
             event: "onBeforeNavigate",
             details: { frameId: 0,
                        processId: 0,
                        tabId: 0,
                        timeStamp: 0,
                        url: getURL('failures/a.html') }},
           { label: "a-onCommitted",
             event: "onCommitted",
@@ skipping 102 matching lines @@
             details: { error: "net::ERR_ABORTED",
                        frameId: 0,
                        processId: 0,
                        tabId: 0,
                        timeStamp: 0,
                        url: getURL('failures/e.html') }}],
           [["onBeforeNavigate", "onCommitted", "onDOMContentLoaded",
             "onErrorOccurred"]]);
         chrome.tabs.update(tabId, { url: getURL('failures/e.html') });
       },
+
+      // Navigates to a non-existent page (this test case must be last,
+      // otherwise the non-existant URL breaks tests that follow, since loading
+      // those test pages is seen as a non-extension -> extension URL
+      // transition, which is forbidden by web_accessible_resources enforcement
+      // in manifest version 2.)
+      function nonExistent() {
+        expect([
+          { label: "onBeforeNavigate",
+            event: "onBeforeNavigate",
+            details: { frameId: 0,
+                       processId: 0,
+                       tabId: 0,
+                       timeStamp: 0,
+                       url: getURL('failures/nonexistent.html') }},
+          { label: "onErrorOccurred",
+            event: "onErrorOccurred",
+            details: { error: "net::ERR_FILE_NOT_FOUND",
+                       frameId: 0,
+                       processId: 0,
+                       tabId: 0,
+                       timeStamp: 0,
+                       url: getURL('failures/nonexistent.html') }}],
+          [["onBeforeNavigate", "onErrorOccurred"]]);
+        chrome.tabs.update(tabId, { url: getURL('failures/nonexistent.html') });
+      },
     ]);
   });
-}
+};