[rAc] Disable sign-in link while the user's signed-in state is unknown.

chrome/browser/ui/cocoa/autofill/autofill_account_chooser.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.
 
 #import "chrome/browser/ui/cocoa/autofill/autofill_account_chooser.h"
 
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/ui/autofill/autofill_dialog_view_delegate.h"
 #include "chrome/browser/ui/chrome_style.h"
 #include "chrome/browser/ui/cocoa/autofill/autofill_dialog_constants.h"
@@ skipping 89 matching lines @@
   [icon_ setImage:iconImage];
 
   // Set title.
   NSString* popupTitle =
       base::SysUTF16ToNSString(delegate_->AccountChooserText());
   [popup_ setTitle:popupTitle];
 
   NSString* linkTitle =
       base::SysUTF16ToNSString(delegate_->SignInLinkText());
   [link_ setTitle:linkTitle];
+  [link_ setEnabled:!delegate_->ShouldDisableSignInLink()];
 
   // populate menu
   NSMenu* accountMenu = [popup_ attachedMenu];
   [accountMenu removeAllItems];
   // See menu_button.h for documentation on why this is needed.
   [accountMenu addItemWithTitle:@"" action:nil keyEquivalent:@""];
   ui::MenuModel* model = delegate_->MenuModelForAccountChooser();
   if (model) {
     for (int i = 0; i < model->GetItemCount(); ++i) {
       AddMenuItem(accountMenu,
@@ skipping 22 matching lines @@
   frame.origin.x = NSMaxX(bounds) - NSWidth(frame);
   [activeControl setFrame:frame];
 
   [icon_ setFrameSize:[[icon_ image] size]];
   frame.origin.x -= NSWidth([icon_ frame]) + kAroundTextPadding;
   [icon_ setFrameOrigin:frame.origin];
 }
 
 @end