Disable setting incognito prefs for extensions for now.

chrome/test/data/extensions/api_test/proxy/individual_remove/test.js

Index: chrome/test/data/extensions/api_test/proxy/individual_remove/test.js
diff --git a/chrome/test/data/extensions/api_test/proxy/individual_remove/test.js b/chrome/test/data/extensions/api_test/proxy/individual_remove/test.js
index d984c0c586e3f0acfdbc8cd16c3eff81dc86fc2c..f62019d524e4e48f1f4cd862f07b1d9ff4d801ca 100644
--- a/chrome/test/data/extensions/api_test/proxy/individual_remove/test.js
+++ b/chrome/test/data/extensions/api_test/proxy/individual_remove/test.js
@@ -40,12 +40,12 @@ chrome.test.runTests([
   },
   function setIndividualProxies() {
     chrome.experimental.proxy.settings.set(
-        {'value': config, 'incognito': false},
+        {'value': config, 'scope': 'regular'},
         chrome.test.callbackPass());
   },
   function clearProxies() {
     chrome.experimental.proxy.settings.clear(
-        {'incognito': false},
+        {'scope': 'regular'},
         chrome.test.callbackPass());
   }
 ]);