Introduce incognito preference settings.

chrome/browser/ui/cocoa/window_size_autosaver_unittest.mm

Index: chrome/browser/ui/cocoa/window_size_autosaver_unittest.mm
diff --git a/chrome/browser/ui/cocoa/window_size_autosaver_unittest.mm b/chrome/browser/ui/cocoa/window_size_autosaver_unittest.mm
index c3b33ed3eee9649e4af94d43ee40b3a2728c12da..e2af3ac6e52cbdc12214946b2677942aeac09055 100644
--- a/chrome/browser/ui/cocoa/window_size_autosaver_unittest.mm
+++ b/chrome/browser/ui/cocoa/window_size_autosaver_unittest.mm
@@ -44,7 +44,9 @@ TEST_F(WindowSizeAutosaverTest, RestoresAndSavesPos) {
   ASSERT_TRUE(pref != NULL);
 
   // Check to make sure there is no existing pref for window placement.
-  ASSERT_TRUE(pref->GetDictionary(path_) == NULL);
+  const DictionaryValue* placement = pref->GetDictionary(path_);
+  ASSERT_TRUE(placement);
+  EXPECT_TRUE(placement->empty());
 
   // Replace the window with one that doesn't have resize controls.
   [window_ close];
@@ -109,7 +111,9 @@ TEST_F(WindowSizeAutosaverTest, RestoresAndSavesRect) {
   ASSERT_TRUE(pref != NULL);
 
   // Check to make sure there is no existing pref for window placement.
-  ASSERT_TRUE(pref->GetDictionary(path_) == NULL);
+  const DictionaryValue* placement = pref->GetDictionary(path_);
+  ASSERT_TRUE(placement);
+  EXPECT_TRUE(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