Update Mac notification tray behavior.

ui/message_center/cocoa/status_item_view_unittest.mm

Index: ui/message_center/cocoa/status_item_view_unittest.mm
diff --git a/ui/message_center/cocoa/status_item_view_unittest.mm b/ui/message_center/cocoa/status_item_view_unittest.mm
index 519fdd515c71b3419e68fe0fa766481c65dfa463..424d20f3514aa0fa008c55e0339b263167f2cc6c 100644
--- a/ui/message_center/cocoa/status_item_view_unittest.mm
+++ b/ui/message_center/cocoa/status_item_view_unittest.mm
@@ -52,30 +52,21 @@ TEST_F(StatusItemViewTest, Callback) {
 TEST_F(StatusItemViewTest, UnreadCount) {
   CGFloat initial_width = NSWidth([view_ frame]);
 
-  CGFloat width = initial_width;
-  [view_ setUnreadCount:2];
+  [view_ setUnreadCount:2 withQuietMode:NO];
   [view_ display];
-  EXPECT_GT(NSWidth([view_ frame]), width);
-  width = NSWidth([view_ frame]);
+  EXPECT_EQ(NSWidth([view_ frame]), initial_width);
 
-  [view_ setUnreadCount:10];
+  [view_ setUnreadCount:0 withQuietMode:NO];
   [view_ display];
-  EXPECT_GT(NSWidth([view_ frame]), width);
-  width = NSWidth([view_ frame]);
+  EXPECT_EQ(NSWidth([view_ frame]), initial_width);
 
-  CGFloat max_width = width;
-
-  [view_ setUnreadCount:0];
+  [view_ setUnreadCount:1000 withQuietMode:YES];
   [view_ display];
-  EXPECT_LT(NSWidth([view_ frame]), width);
-  width = NSWidth([view_ frame]);
-  EXPECT_CGFLOAT_EQ(width, initial_width);
+  EXPECT_EQ(NSWidth([view_ frame]), initial_width);
 
-  [view_ setUnreadCount:1000];
+  [view_ setUnreadCount:0 withQuietMode:YES];
   [view_ display];
-  EXPECT_GT(NSWidth([view_ frame]), width);
-  width = NSWidth([view_ frame]);
-  EXPECT_CGFLOAT_EQ(width, max_width);
+  EXPECT_EQ(NSWidth([view_ frame]), initial_width);
 }
 
 TEST_F(StatusItemViewTest, Highlight) {