[Mac] Inform reference counted objects that hold a weak Browser* when the Browser is being destroye…

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

 // Copyright 2014 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 "chrome/browser/ui/cocoa/profiles/avatar_base_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile_avatar_icon_util.h"
@@ skipping 113 matching lines @@
 - (id)initWithBrowser:(Browser*)browser {
   if ((self = [super init])) {
     browser_ = browser;
     profileInfoObserver_.reset(
         new ProfileInfoUpdateObserver(browser_->profile(), self));
   }
   return self;
 }
 
 - (void)dealloc {
+  [self browserWillBeDestroyed];
+  [super dealloc];
+}
+
+- (void)browserWillBeDestroyed {
   [[NSNotificationCenter defaultCenter]
       removeObserver:self
                 name:NSWindowWillCloseNotification
               object:[menuController_ window]];
-  [super dealloc];
+  browser_ = nullptr;
 }
 
 - (NSButton*)buttonView {
   CHECK(button_.get());  // Subclasses must set this.
   return button_.get();
 }
 
 - (void)showAvatarBubbleAnchoredAt:(NSView*)anchor
                           withMode:(BrowserWindow::AvatarBubbleMode)mode
                    withServiceType:(signin::GAIAServiceType)serviceType {
@@ skipping 106 matching lines @@
 }
 
 - (void)updateErrorStatus:(BOOL)hasError {
 }
 
 - (BaseBubbleController*)menuController {
   return menuController_;
 }
 
 @end