Moves maintaining root_window_for_new_windows_ to Shell

chrome/browser/ui/window_sizer/window_sizer.cc

 // 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.
 
 #include "chrome/browser/ui/window_sizer/window_sizer.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 143 matching lines @@
 class DefaultTargetDisplayProvider : public WindowSizer::TargetDisplayProvider {
  public:
   DefaultTargetDisplayProvider() {}
   ~DefaultTargetDisplayProvider() override {}
 
   display::Display GetTargetDisplay(const display::Screen* screen,
                                     const gfx::Rect& bounds) const override {
 #if defined(USE_ASH)
     // Use the target display on ash.
     if (ash_util::ShouldOpenAshOnStartup()) {
-      aura::Window* target = ash::Shell::GetTargetRootWindow();
+      aura::Window* target = ash::Shell::GetRootWindowForNewWindows();
       return screen->GetDisplayNearestWindow(target);
     }
 #endif
     // Find the size of the work area of the monitor that intersects the bounds
     // of the anchor window.
     return screen->GetDisplayMatching(bounds);
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DefaultTargetDisplayProvider);
@@ skipping 255 matching lines @@
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kStartMaximized))
     return ui::SHOW_STATE_MAXIMIZED;
 
   if (browser_->initial_show_state() != ui::SHOW_STATE_DEFAULT)
     return browser_->initial_show_state();
 
   // Otherwise we use the default which can be overridden later on.
   return ui::SHOW_STATE_DEFAULT;
 }