Convert tabs, windows, and extension APIs to feature system.

chrome/test/data/extensions/api_test/stubs/content_script.js

Index: chrome/test/data/extensions/api_test/stubs/content_script.js
diff --git a/chrome/test/data/extensions/api_test/stubs/content_script.js b/chrome/test/data/extensions/api_test/stubs/content_script.js
index 3eacb11029a6917f5e0fc72ac83c796ebc3e05e2..94de426343f6f076237efef739fafe906515244e 100644
--- a/chrome/test/data/extensions/api_test/stubs/content_script.js
+++ b/chrome/test/data/extensions/api_test/stubs/content_script.js
@@ -18,6 +18,10 @@ chrome.extension.sendRequest("getApi", function(apis) {
   var privilegedPaths = [];
   var unprivilegedPaths = [];
   apis.forEach(function(module) {
+    // TODO(aa): Remove this whole test when all the APIs have been converted to
+    // the feature system.
+    if (module.uses_feature_system)
+      return;
     var namespace = module.namespace;
 
     ["functions", "events"].forEach(function(section) {
@@ -86,7 +90,7 @@ function testPath(path, expectError) {
           return false;
         }
         var str = err.toString();
-        if (str.search("can only be used in extension processes.") != -1) {
+        if (str.search("cannot be used in this context.") != -1) {
           return true;
         } else {
           logToConsoleAndStdout(