Disable setting incognito prefs for extensions for now.

chrome/test/data/extensions/api_test/content_settings/onchange/test.html

Index: chrome/test/data/extensions/api_test/content_settings/onchange/test.html
diff --git a/chrome/test/data/extensions/api_test/content_settings/onchange/test.html b/chrome/test/data/extensions/api_test/content_settings/onchange/test.html
index 92d0758609ef8d388c6e6656df83e9e3c9608dcd..7cfff1fd5a32b685d5efd631338a28f32617cef2 100644
--- a/chrome/test/data/extensions/api_test/content_settings/onchange/test.html
+++ b/chrome/test/data/extensions/api_test/content_settings/onchange/test.html
@@ -35,6 +35,8 @@ chrome.test.runTests([
       'value':true
     }, chrome.test.callbackPass());
   },
+  // TODO(battre): re-enable when incognito is available again.
+  /*
   function changeIncognitoOnly() {
     listenUntil(cs.misc.blockThirdPartyCookies.onChange, [{
       'value': false,
@@ -46,6 +48,7 @@ chrome.test.runTests([
       'incognito': true
     }, chrome.test.callbackPass());
   },
+  */
   function changeDefaultOnly() {
     listenUntil(cs.misc.blockThirdPartyCookies.onChange, [{
       'value': false,
@@ -55,6 +58,8 @@ chrome.test.runTests([
       'value': false
     }, chrome.test.callbackPass());
   },
+  // TODO(battre): re-enable when incognito is available again.
+  /*
   function changeIncognitoOnlyBack() {
     // Change the incognito setting back to true so that we get an event when
     // clearing the value.
@@ -78,6 +83,7 @@ chrome.test.runTests([
       'incognito': true
     }, chrome.test.callbackPass());
   },
+  */
   function clearDefault() {
     listenUntil(cs.misc.blockThirdPartyCookies.onChange, [{
       'value': false,