Fix fast user switcher appearance when empty.

chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm

Index: chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
diff --git a/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm b/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
index 66a424ad327b0aeb50b151867c7b65c4f1ac496d..07898bc68f9ac8d73a98a74ce8b3273d9cddf48c 100644
--- a/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
+++ b/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
@@ -187,6 +187,14 @@ class ProfileInfoUpdateObserver : public ProfileInfoCacheObserver,
     profiles::TutorialMode tutorialMode;
     profiles::BubbleViewModeFromAvatarBubbleMode(
         mode, &viewMode, &tutorialMode);
+    // Don't start creating the view if it would be an empty fast user switcher.
+    // This is the case when there is 0 or 1 profiles (the current one).  It has
+    // to happen here to prevent the creation of an empty container.
+    if (viewMode == profiles::BUBBLE_VIEW_MODE_FAST_PROFILE_CHOOSER &&
+        g_browser_process->profile_manager()->GetNumberOfProfiles() <= 1) {
+      return;
+    }
+
     menuController_ =
         [[ProfileChooserController alloc] initWithBrowser:browser_
                                                anchoredAt:point