Moves couple of WmShell methods to standalone functions

ash/common/wm/window_positioner.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 "ash/common/wm/window_positioner.h"
 
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/window_positioning_utils.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm/wm_screen_util.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/shell.h"
+#include "ash/wm/window_util.h"
 #include "ui/compositor/layer.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/gfx/geometry/insets.h"
 
 namespace ash {
 
 const int WindowPositioner::kMinimumWindowOffset = 32;
 
 // The number of pixels which are kept free top, left and right when a window
@@ skipping 127 matching lines @@
     window->SetBounds(bounds);
 }
 
 // Get the first open (non minimized) window which is on the screen defined.
 WmWindow* GetReferenceWindow(const WmWindow* root_window,
                              const WmWindow* exclude,
                              bool* single_window) {
   if (single_window)
     *single_window = true;
   // Get the active window.
-  WmWindow* active = root_window->GetShell()->GetActiveWindow();
+  WmWindow* active = WmWindow::Get(wm::GetActiveWindow());
   if (active && active->GetRootWindow() != root_window)
     active = NULL;
 
   // Get a list of all windows.
   const std::vector<WmWindow*> windows =
       Shell::Get()->mru_window_tracker()->BuildWindowListIgnoreModal();
 
   if (windows.empty())
     return nullptr;
 
@@ skipping 239 matching lines @@
   if (!pop_position_offset_increment_x) {
     // When the popup position increment is 0, the last popup position
     // was not yet initialized.
     last_popup_position_x_ = popup_position_offset_from_screen_corner_x;
     last_popup_position_y_ = popup_position_offset_from_screen_corner_y;
   }
   pop_position_offset_increment_x = grid;
   pop_position_offset_increment_y = grid;
   // We handle the Multi monitor support by retrieving the active window's
   // work area.
-  WmWindow* window = WmShell::Get()->GetActiveWindow();
+  WmWindow* window = WmWindow::Get(wm::GetActiveWindow());
   const gfx::Rect work_area =
       window && window->IsVisible()
           ? window->GetDisplayNearestWindow().work_area()
           : display::Screen::GetScreen()->GetPrimaryDisplay().work_area();
   // Only try to reposition the popup when it is not spanning the entire
   // screen.
   if ((old_pos.width() + popup_position_offset_from_screen_corner_x >=
        work_area.width()) ||
       (old_pos.height() + popup_position_offset_from_screen_corner_y >=
        work_area.height()))
@@ skipping 122 matching lines @@
   // If the alignment was pushing the window out of the screen, we ignore the
   // alignment for that call.
   if (abs(pos.right() - work_area.right()) < grid)
     x = work_area.right() - w;
   if (abs(pos.bottom() - work_area.bottom()) < grid)
     y = work_area.bottom() - h;
   return gfx::Rect(x, y, w, h);
 }
 
 }  // namespace ash