Makes the launcher auto-hide for maximized windows. This turned out to

ash/wm/workspace/snap_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 "ash/wm/workspace/snap_sizer.h"
 
 #include <cmath>
 
+#include "ash/screen_ash.h"
 #include "ash/wm/window_resizer.h"
 #include "ui/aura/window.h"
 #include "ui/gfx/screen.h"
 
 namespace ash {
 namespace internal {
 
 namespace {
 
 // Percent of the screen (width) to give the window.
@@ skipping 67 matching lines @@
                        std::max(percent_index_ + delta, 0));
   if (index != percent_index_) {
     percent_index_ = index;
     target_bounds_ = GetTargetBounds();
   }
   num_moves_since_adjust_ = 0;
   last_adjust_x_ = x;
 }
 
 gfx::Rect SnapSizer::GetTargetBounds() const {
-  gfx::Rect work_area(gfx::Screen::GetMonitorWorkAreaNearestWindow(window_));
+  gfx::Rect work_area(ScreenAsh::GetUnmaximizedWorkAreaBounds(window_));
   int y = WindowResizer::AlignToGridRoundUp(work_area.y(), grid_size_);
   int max_y =
       WindowResizer::AlignToGridRoundDown(work_area.bottom(), grid_size_);
   int width = static_cast<float>(work_area.width()) * kPercents[percent_index_];
   if (edge_ == LEFT_EDGE) {
     int x = WindowResizer::AlignToGridRoundUp(work_area.x(), grid_size_);
     int mid_x = WindowResizer::AlignToGridRoundUp(
         work_area.x() + width, grid_size_);
     return gfx::Rect(x, y, mid_x - x, max_y - y);
   }
   int max_x =
       WindowResizer::AlignToGridRoundDown(work_area.right(), grid_size_);
   int x = WindowResizer::AlignToGridRoundUp(max_x - width, grid_size_);
   return gfx::Rect(x , y, max_x - x, max_y - y);
 }
 
 bool SnapSizer::AlongEdge(int x) const {
   // TODO: need to support multi-monitor.
   gfx::Rect area(gfx::Screen::GetMonitorAreaNearestWindow(window_));
   return (x <= area.x()) || (x >= area.right() - 1);
 }
 
 }  // namespace internal
 }  // namespace ash