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

ash/wm/workspace/snap_sizer.cc

Index: ash/wm/workspace/snap_sizer.cc
diff --git a/ash/wm/workspace/snap_sizer.cc b/ash/wm/workspace/snap_sizer.cc
index d2641b08d4886e0b2faa561fe5b3f12db3a8d52c..8ee3e1f3fcdad918218454bcba1f6628be59f404 100644
--- a/ash/wm/workspace/snap_sizer.cc
+++ b/ash/wm/workspace/snap_sizer.cc
@@ -6,6 +6,7 @@
 
 #include <cmath>
 
+#include "ash/screen_ash.h"
 #include "ash/wm/window_resizer.h"
 #include "ui/aura/window.h"
 #include "ui/gfx/screen.h"
@@ -93,7 +94,7 @@ void SnapSizer::ChangeBounds(int x, int delta) {
 }
 
 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_);