Enable AutoResize for Constrained Web Dialogs for Mac.

chrome/browser/ui/cocoa/autofill/card_unmask_prompt_view_bridge.mm

 // Copyright (c) 2015 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 "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/ui/autofill/autofill_dialog_models.h"
 #include "chrome/browser/ui/autofill/autofill_dialog_types.h"
@@ skipping 69 matching lines @@
 CardUnmaskPromptViewBridge::~CardUnmaskPromptViewBridge() {
 }
 
 void CardUnmaskPromptViewBridge::Show() {
   // Setup the constrained window that will show the view.
   base::scoped_nsobject<NSWindow> window([[ConstrainedWindowCustomWindow alloc]
       initWithContentRect:[[view_controller_ view] bounds]]);
   [window setContentView:[view_controller_ view]];
   base::scoped_nsobject<CustomConstrainedWindowSheet> sheet(
       [[CustomConstrainedWindowSheet alloc] initWithCustomWindow:window]);
-  constrained_window_.reset(
-      new ConstrainedWindowMac(this, web_contents_, sheet));
+  constrained_window_.reset(ShowWebModalDialogMac(this, web_contents_, sheet));
 }
 
 void CardUnmaskPromptViewBridge::ControllerGone() {
   controller_ = nullptr;
   PerformClose();
 }
 
 void CardUnmaskPromptViewBridge::DisableAndWaitForVerification() {
   [view_controller_ setProgressOverlayText:
                         l10n_util::GetStringUTF16(
@@ skipping 636 matching lines @@
   [verifyButton_ setAction:@selector(onVerify:)];
   [verifyButton_ sizeToFit];
   [self updateVerifyButtonEnabled];
   [mainView addSubview:verifyButton_];
 
   [self setView:mainView];
   [self performLayoutAndDisplay:NO];
 }
 
 @end