Newly created profiles should have the grey silhouette as avatar.

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 "chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h"
 
 #include "base/mac/bundle_locations.h"
 #include "base/prefs/pref_service.h"
@@ skipping 1198 matching lines @@
   }
 
   [container addSubview:link];
   [container setFrameSize:rect.size];
   return container.autorelease();
 }
 
 - (NSView*)createGuestProfileView {
   gfx::Image guestIcon =
       ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
-          IDR_LOGIN_GUEST);
+          profiles::GetPlaceholderAvatarIconResourceID());
   AvatarMenu::Item guestItem(std::string::npos, /* menu_index, not used */
                              std::string::npos, /* profile_index, not used */
                              guestIcon);
   guestItem.active = true;
   guestItem.name = base::SysNSStringToUTF16(
       l10n_util::GetNSString(IDS_PROFILES_GUEST_PROFILE_NAME));
 
   return [self createCurrentProfileView:guestItem];
 }
 
@@ skipping 306 matching lines @@
   [button setTitle:ElideEmail(title, rect.size.width)];
   [button setAlignment:NSLeftTextAlignment];
   [button setBordered:NO];
   [button setTarget:self];
   [button setAction:@selector(showAccountRemovalView:)];
 
   return button.autorelease();
 }
 
 @end