[Mac] Allow "Enter" to activate the buttons in the new avatar bubble.

chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm

 // Copyright 2014 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 <Cocoa/Cocoa.h>
+#import <Carbon/Carbon.h>  // kVK_Return.
 
 #import "chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h"
 
 #include "base/mac/bundle_locations.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 766 matching lines @@
 }
 
 - (void)setHoverState:(HoverState)state {
   [super setHoverState:state];
   bool isHighlighted = ([self hoverState] != kHoverStateNone);
 
   NSColor* backgroundColor = isHighlighted ? hoverColor_ : backgroundColor_;
   [[self cell] setBackgroundColor:backgroundColor];
 }
 
+-(void)keyDown:(NSEvent*)event {
+  // Since there is no default button in the bubble, it is safe to activate
+  // all buttons on Enter as well, and be consistent with the Windows
+  // implementation.
+  if ([event keyCode] == kVK_Return)
+    [self performClick:self];
+  else
+    [super keyDown:event];
+}
+
 - (BOOL)canBecomeKeyView {
   return YES;
 }
 
 @end
 
 // A custom view with the given background color.
 @interface BackgroundColorView : NSView {
  @private
   base::scoped_nsobject<NSColor> backgroundColor_;
@@ skipping 1457 matching lines @@
 }
 
 - (bool)shouldShowGoIncognito {
   bool incognitoAvailable =
       IncognitoModePrefs::GetAvailability(browser_->profile()->GetPrefs()) !=
           IncognitoModePrefs::DISABLED;
   return incognitoAvailable && !browser_->profile()->IsGuestSession();
 }
 
 @end