Use existing model for initial layout, if we can.

chrome/browser/ui/cocoa/web_intent_sheet_controller.mm

 // Copyright (c) 2012 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/web_intent_sheet_controller.h"
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/browser_list.h"
@@ skipping 441 matching lines @@
   // |window| is retained by the ConstrainedWindowMacDelegateCustomSheet when
   // the sheet is initialized.
   scoped_nsobject<NSWindow> window(
       [[NSWindow alloc] initWithContentRect:contentRect
                                   styleMask:NSTitledWindowMask
                                     backing:NSBackingStoreBuffered
                                       defer:YES]);
 
   if ((self = [super initWithWindow:window.get()])) {
     picker_ = picker;
+    if (picker)
+      model_ = picker->model();
     intentButtons_.reset([[NSMutableArray alloc] init]);
-    [self performLayoutWithModel:NULL];
+    [self performLayoutWithModel:model_];
     [[self window] makeFirstResponder:self];
   }
   return self;
 }
 
 // Handle default OSX dialog cancel mechanisms. (Cmd-.)
 - (void)cancelOperation:(id)sender {
   if (picker_)
     picker_->OnCancelled();
   [self closeSheet];
@@ skipping 267 matching lines @@
 - (void)stopThrobber {
   [closeButton_ setEnabled:YES];
   [self setIntentButtonsEnabled:YES];
   [suggestionView_ stopThrobber];
 }
 
 - (void)closeSheet {
   [NSApp endSheet:[self window]];
 }
 @end  // WebIntentPickerSheetController