Revert of Sets the default background color of inline signin and user manager to grey

chrome/browser/ui/cocoa/profiles/user_manager_mac.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.
 
 #include "chrome/browser/ui/cocoa/profiles/user_manager_mac.h"
 
 #include "base/mac/foundation_util.h"
 #include "chrome/app/chrome_command_ids.h"
 #import "chrome/browser/app_controller_mac.h"
 #include "chrome/browser/browser_process.h"
-#include "chrome/browser/profiles/profile_avatar_icon_util.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/profiles/profiles_state.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #import "chrome/browser/ui/cocoa/browser_window_utils.h"
 #include "chrome/browser/ui/cocoa/chrome_event_processing_window.h"
 #include "chrome/browser/ui/user_manager.h"
 #include "chrome/grit/chromium_strings.h"
 #include "content/public/browser/native_web_keyboard_event.h"
-#include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 
 
 // An open User Manager window. There can only be one open at a time. This
 // is reset to NULL when the window is closed.
 UserManagerMac* instance_ = NULL;  // Weak.
 
@@ skipping 92 matching lines @@
 
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   [super dealloc];
 }
 
 - (void)showURL:(const GURL&)url {
   webContents_->GetController().LoadURL(url, content::Referrer(),
                                         ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
                                         std::string());
-  content::RenderWidgetHostView* rwhv = webContents_->GetRenderWidgetHostView();
-  if (rwhv)
-    rwhv->SetBackgroundColor(profiles::kUserManagerBackgroundColor);
   [self show];
 }
 
 - (void)show {
   // Because the User Manager isn't a BrowserWindowController, activating it
   // will not trigger a -windowChangedToProfile and update the menu bar.
   // This is only important if the active profile is Guest, which may have
   // happened after locking a profile.
   Profile* guestProfile = profiles::SetActiveProfileToGuestIfLocked();
   if (guestProfile && guestProfile->IsGuestSession()) {
@@ skipping 63 matching lines @@
                                            const std::string& url) {
   DCHECK(!instance_);
   instance_ = new UserManagerMac(guest_profile);
   [instance_->window_controller() showURL:GURL(url)];
 }
 
 void UserManagerMac::WindowWasClosed() {
   instance_ = NULL;
   delete this;
 }