Set focus to PIN entry box in pref-pane

remoting/host/me2me_preference_pane_confirm_pin.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 "me2me_preference_pane_confirm_pin.h"
 
 @implementation Me2MePreferencePaneConfirmPin
 
 @synthesize delegate = delegate_;
 
@@ skipping 12 matching lines @@
   [email_ setStringValue:email];
 }
 
 - (void)setButtonText:(NSString*)text {
   [apply_button_ setTitle:text];
 }
 
 - (void)setEnabled:(BOOL)enabled {
   [apply_button_ setEnabled:enabled];
   [pin_ setEnabled:enabled];
+  [[[self view] window] makeFirstResponder:pin_];
+  [apply_button_ setKeyEquivalent:@"\r"];
 }
 
 - (void)resetPin {
   [pin_ setStringValue:@""];
 }
 
 - (void)onApply:(id)sender {
   [delegate_ applyConfiguration:self
                             pin:[pin_ stringValue]];
 }
 
 @end