Introduce incognito preference settings.

chrome/browser/ui/cocoa/browser_window_controller_unittest.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_unittest.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_unittest.mm b/chrome/browser/ui/cocoa/browser_window_controller_unittest.mm
index d16401fd2e3f71bd71c3f472455ae8ce9bd4a6ae..1d6fd72c68966ed2e5e02e0c8ff0f87bd7aaee1e 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_unittest.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_unittest.mm
@@ -85,14 +85,20 @@ TEST_F(BrowserWindowControllerTest, TestSaveWindowPosition) {
   ASSERT_TRUE(prefs != NULL);
 
   // Check to make sure there is no existing pref for window placement.
-  ASSERT_TRUE(prefs->GetDictionary(prefs::kBrowserWindowPlacement) == NULL);
+  const DictionaryValue* browser_window_placement =
+      prefs->GetDictionary(prefs::kBrowserWindowPlacement);
+  ASSERT_TRUE(browser_window_placement);
+  EXPECT_TRUE(browser_window_placement->empty());
 
   // Ask the window to save its position, then check that a preference
   // exists.  We're technically passing in a pointer to the user prefs
   // and not the local state prefs, but a PrefService* is a
   // PrefService*, and this is a unittest.
   [controller_ saveWindowPositionToPrefs:prefs];
-  EXPECT_TRUE(prefs->GetDictionary(prefs::kBrowserWindowPlacement) != NULL);
+  browser_window_placement =
+      prefs->GetDictionary(prefs::kBrowserWindowPlacement);
+  ASSERT_TRUE(browser_window_placement);
+  EXPECT_FALSE(browser_window_placement->empty());
 }
 
 TEST_F(BrowserWindowControllerTest, TestFullScreenWindow) {