[Mac] Convert Omnibox paste-and-go to use AutocompleteTextFieldObserver.

chrome/browser/autocomplete/autocomplete_popup_view_mac.mm

 // Copyright (c) 2009 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 "chrome/browser/autocomplete/autocomplete_popup_view_mac.h"
 
 #include "app/gfx/text_elider.h"
 #include "base/sys_string_conversions.h"
 #include "base/gfx/rect.h"
 #include "chrome/browser/autocomplete/autocomplete_edit.h"
@@ skipping 308 matching lines @@
     [nc addObserver:matrix_target_
            selector:@selector(windowDidResize:)
                name:NSWindowDidResizeNotification
              object:[field_ window]];
   }
 }
 
 void AutocompletePopupViewMac::UpdatePopupAppearance() {
   const AutocompleteResult& result = model_->result();
   if (result.empty()) {
+    NSLog(@"Empty results in UpdatePopupAppearance");
     [[popup_ parentWindow] removeChildWindow:popup_];
     [popup_ orderOut:nil];
 
     // Break references to matrix_target_ before releasing popup_.
     NSMatrix* matrix = [popup_ contentView];
     [matrix setTarget:nil];
 
     NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
     [nc removeObserver:matrix_target_
                   name:NSWindowDidResizeNotification
@@ skipping 351 matching lines @@
   DCHECK(popup_view_);
 
   // TODO(shess): UpdatePopupAppearance() is called frequently, so it
   // should be really cheap, but in this case we could probably make
   // things even cheaper by refactoring between the popup-placement
   // code and the matrix-population code.
   popup_view_->UpdatePopupAppearance();
 }
 
 @end