Simplify some old avatar menu button code.

chrome/browser/chromeos/profiles/avatar_menu_chromeos.cc

 // Copyright 2013 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/profiles/avatar_menu.h"
 
 #include <string>
 
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/session_util.h"
 
 #include "ui/gfx/image/image.h"
 
 // static
 void AvatarMenu::GetImageForMenuButton(const base::FilePath& profile_path,
-                                       gfx::Image* image,
-                                       bool* is_rectangle) {
+                                       gfx::Image* image) {
   // ChromeOS avatar icon is circular.
-  *is_rectangle = false;
   Profile* profile =
       g_browser_process->profile_manager()->GetProfileByPath(profile_path);
   *image = gfx::Image(GetAvatarImageForContext(profile));
 }