Use delegate protocols present in the 10.6 SDK

chrome/browser/autocomplete/autocomplete_edit_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_edit_view_mac.h"
 
 #include <Carbon/Carbon.h>  // kVK_Return
 #include "app/gfx/font.h"
 #include "app/resource_bundle.h"
 #include "base/clipboard.h"
+#import "base/cocoa_protocols_mac.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_edit.h"
 #include "chrome/browser/autocomplete/autocomplete_popup_model.h"
 #include "chrome/browser/autocomplete/autocomplete_popup_view_mac.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/cocoa/autocomplete_text_field.h"
 #include "chrome/browser/cocoa/event_utils.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 
@@ skipping 97 matching lines @@
   return NSMakeRange(static_cast<NSInteger>(component.begin),
                      static_cast<NSInteger>(component.len));
 }
 
 }  // namespace
 
 // Thin Obj-C bridge class that is the delegate of the omnibox field.
 // It intercepts various control delegate methods and vectors them to
 // the edit view.
 
-@interface AutocompleteFieldDelegate : NSObject {
+@interface AutocompleteFieldDelegate : NSObject<NSTextFieldDelegate> {
  @private
   AutocompleteEditViewMac* edit_view_;  // weak, owns us.
 }
 - initWithEditView:(AutocompleteEditViewMac*)view;
 - (void)windowDidResignKey:(NSNotification*)notification;
 @end
 
 // TODO(shess): AutocompletePopupViewMac doesn't really need an
 // NSTextField.  It wants to know where the position the popup, what
 // font to use, and it also needs to be able to attach the popup to
@@ skipping 708 matching lines @@
 // prepended and ".com" appended.  This calls down to
 // AutocompleteEditModel::OnControlKeyChanged() so that it can change
 // the popup to reflect this.  See autocomplete_edit.cc
 // OnControlKeyChanged() and OnAfterPossibleChange().
 - (void)control:(NSControl*)control flagsChanged:(NSEvent*)theEvent {
   bool controlFlag = ([theEvent modifierFlags]&NSControlKeyMask) != 0;
   edit_view_->OnControlKeyChanged(controlFlag);
 }
 
 @end