Don't try to use ManagePasswordsBubbleModel if the password bubble was closed.

chrome/browser/ui/cocoa/passwords/pending_password_view_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.
 
 #include <algorithm>
 
 #import "chrome/browser/ui/cocoa/passwords/pending_password_view_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/ui/chrome_style.h"
 #import "chrome/browser/ui/cocoa/hover_close_button.h"
 #import "chrome/browser/ui/cocoa/passwords/passwords_bubble_utils.h"
 #include "chrome/browser/ui/passwords/manage_passwords_bubble_model.h"
 #include "chrome/grit/generated_resources.h"
 #include "skia/ext/skia_utils_mac.h"
 #import "third_party/google_toolbox_for_mac/src/AppKit/GTMUILocalizerAndLayoutTweaker.h"
 #import "ui/base/cocoa/controls/hyperlink_text_view.h"
 #include "ui/base/l10n/l10n_util.h"
 
 const SkColor kWarmWelcomeColor = SkColorSetRGB(0x64, 0x64, 0x64);
 
 @implementation PendingPasswordViewController
 
-- (id)initWithModel:(ManagePasswordsBubbleModel*)model
-           delegate:(id<ManagePasswordsBubbleContentViewDelegate>)delegate {
-  if (([super initWithDelegate:delegate])) {
-    model_ = model;
-  }
-  return self;
-}
-
 - (BOOL)textView:(NSTextView*)textView
     clickedOnLink:(id)link
           atIndex:(NSUInteger)charIndex {
-  model_->OnBrandLinkClicked();
+  ManagePasswordsBubbleModel* model = [self model];
+  if (model)
+    model->OnBrandLinkClicked();
   [delegate_ viewShouldDismiss];
   return YES;
 }
 
 - (base::scoped_nsobject<NSButton>)newCloseButton {
   const int dimension = chrome_style::GetCloseButtonSize();
   NSRect frame = NSMakeRect(0, 0, dimension, dimension);
   base::scoped_nsobject<NSButton> button(
       [[WebUIHoverCloseButton alloc] initWithFrame:frame]);
   [button setAction:@selector(viewShouldDismiss)];
@@ skipping 36 matching lines @@
   // password row, and the buttons row on one line each, but not smaller than
   // kDesiredBubbleWidth.
 
   // Create the elements and add them to the view.
 
   // Close button.
   closeButton_ = [self newCloseButton];
   [view addSubview:closeButton_];
 
   // Title.
+  ManagePasswordsBubbleModel* model = [self model];
   HyperlinkTextView* titleView = TitleLabelWithLink(
-      model_->title(), model_->title_brand_link_range(), self);
+      model->title(), model->title_brand_link_range(), self);
 
   // Force the text to wrap to fit in the bubble size.
   int titleRightPadding =
       2 * chrome_style::kCloseButtonPadding + NSWidth([closeButton_ frame]);
   int titleWidth = kDesiredBubbleWidth - kFramePadding - titleRightPadding;
   [titleView setVerticallyResizable:YES];
   [titleView setFrameSize:NSMakeSize(titleWidth, MAXFLOAT)];
   // Set the same text inset as in |passwordRow|.
   [[titleView textContainer] setLineFragmentPadding:kTitleTextInset];
   [titleView sizeToFit];
@@ skipping 65 matching lines @@
   [closeButton_ setFrameOrigin:closeButtonOrigin];
 
   // Update the bubble size.
 
   [view setFrame:NSMakeRect(0, 0, width, height)];
 
   [self setView:view];
 }
 
 - (ManagePasswordsBubbleModel*)model {
-  return model_;
+  return [delegate_ model];
 }
 
 @end
 
 @implementation PendingPasswordViewController (Testing)
 
 - (NSButton*)closeButton {
   return closeButton_.get();
 }
 
 @end