Fix rebuilding the profile selector on the OSX App Launcher.

ui/app_list/cocoa/apps_search_box_controller.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ui/app_list/cocoa/apps_search_box_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "grit/ui_resources.h"
@@ skipping 141 matching lines @@
 
 - (void)clearSearch {
   [searchTextField_ setStringValue:@""];
   [self controlTextDidChange:nil];
 }
 
 - (void)rebuildMenu {
   if (![delegate_ appListDelegate])
     return;
 
+  [menuController_ setModel:NULL];
+  appListMenu_.reset(
+      new app_list::AppListMenu([delegate_ appListDelegate],
+                                [delegate_ appListModel]->users()));
   menuController_.reset([[AppListMenuController alloc]
       initWithSearchBoxController:self]);
   [menuButton_ setMenu:[menuController_ menu]];  // Menu will populate here.
 }
 
 - (void)setDelegate:(id<AppsSearchBoxDelegate>)delegate {
   [[menuButton_ menu] removeAllItems];
   menuController_.reset();
   appListMenu_.reset();
   bridge_.reset();  // Ensure observers are cleared before updating |delegate_|.
   delegate_ = delegate;
   if (!delegate_)
     return;
 
   bridge_.reset(new app_list::SearchBoxModelObserverBridge(self));
-  if (![delegate_ appListDelegate])
-    return;
-
-  appListMenu_.reset(
-      new app_list::AppListMenu([delegate_ appListDelegate],
-                                [delegate_ appListModel]->users()));
   [self rebuildMenu];
 }
 
 - (NSTextField*)searchTextField {
   return searchTextField_;
 }
 
 - (NSPopUpButton*)menuControl {
   return menuButton_;
 }
@@ skipping 191 matching lines @@
   NSPoint anchorPoint = [[menuButton window] convertBaseToScreen:NSMakePoint(
       NSMaxX(anchorRect) + kMenuXOffsetFromButton,
       NSMinY(anchorRect) - kMenuYOffsetFromButton)];
   NSRect confinementRect = [[menuButton window] frame];
   confinementRect.size = NSMakeSize(anchorPoint.x - NSMinX(confinementRect),
                                     anchorPoint.y - NSMinY(confinementRect));
   return confinementRect;
 }
 
 @end