Check for warnings when loading extensions in browser tests.

chrome/test/data/extensions/api_test/stubs/content_script.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.
 
 // Helper function to log message to both the local console and to the
 // background page, so that the latter can output the message via the
 // chrome.test.log() function.
 function logToConsoleAndStdout(msg) {
   console.log(msg);
   chrome.extension.sendRequest("log: " + msg);
 }
 
 // We ask the background page to get the extension API to test against. When it
 // responds we start the test.
 console.log("asking for api ...");
 chrome.extension.sendRequest("getApi", function(apis) {
   console.log("got api response");
   var privilegedPaths = [];
   var unprivilegedPaths = [];
   apis.forEach(function(module) {
     var namespace = module.namespace;
 
     ["functions", "events"].forEach(function(section) {
       if (typeof(module[section]) == "undefined")
         return;
       module[section].forEach(function(entry) {
+        // Ignore entries that are not applicable to the manifest that we're
+        // running under.
+        if (entry.maximumManifestVersion && entry.maximumManifestVersion < 2) {
+          return;
+        }
+
         var path = namespace + "." + entry.name;
         if (module.unprivileged || entry.unprivileged) {
           unprivilegedPaths.push(path);
         } else {
           privilegedPaths.push(path);
         }
       });
     });
 
     if (module.properties) {
@@ skipping 114 matching lines @@
   console.log(success ? "pass" : "fail");
   if (success) {
     reportSuccess();
   } else {
     logToConsoleAndStdout("failures on:\n" + failures.join("\n") +
         "\n\n\n>>> See comment in stubs_apitest.cc for a " +
         "hint about fixing this failure.\n\n");
     reportFailure();
   }
 }