Remove last non-third_party typeofs on Mac.

ui/message_center/cocoa/tray_controller.mm

 // Copyright (c) 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.
 
 #include "ui/message_center/cocoa/tray_controller.h"
 
 #include "ui/base/cocoa/window_size_constants.h"
 #include "ui/base/resource/resource_bundle.h"
 #import "ui/message_center/cocoa/popup_collection.h"
 #import "ui/message_center/cocoa/tray_view_controller.h"
@@ skipping 34 matching lines @@
 
     viewController_.reset([[MCTrayViewController alloc] initWithMessageCenter:
         tray_->message_center()]);
     NSView* contentView = [viewController_ view];
     [window setFrame:[contentView frame] display:NO];
     [window setContentView:contentView];
 
     // The global event monitor will close the tray in response to events
     // delivered to other applications, and -windowDidResignKey: will catch
     // events within the application.
-    __block typeof(self) weakSelf = self;
+    __block MCTrayController* weakSelf = self;
     clickEventMonitor_ =
         [NSEvent addGlobalMonitorForEventsMatchingMask:NSLeftMouseDownMask |
                                                        NSRightMouseDownMask |
                                                        NSOtherMouseDownMask
             handler:^(NSEvent* event) {
                 [weakSelf windowDidResignKey:nil];
             }];
   }
   return self;
 }
@@ skipping 38 matching lines @@
 - (void)windowDidResignKey:(NSNotification*)notification {
   // The settings bubble data structures assume that the settings dialog is
   // visible only for short periods of time: There's a fixed list of permissions
   // for example.
   [viewController_ cleanupSettings];
 
   tray_->HideMessageCenterBubble();
 }
 
 @end