Fixed incorrect frame insets for app windows on ChromeOS

ash/wm/header_painter.cc

Index: ash/wm/header_painter.cc
diff --git a/ash/wm/header_painter.cc b/ash/wm/header_painter.cc
index f6fdfafb45429a993fc130f0b2bef32bfbfc1662..c6db0209e8099d1a83add2f35148b2700c2dc852 100644
--- a/ash/wm/header_painter.cc
+++ b/ash/wm/header_painter.cc
@@ -185,8 +185,6 @@ gfx::Rect HeaderPainter::GetWindowBoundsForClientBounds(
       const gfx::Rect& client_bounds) {
   gfx::Rect window_bounds(client_bounds);
   window_bounds.Inset(0, -header_height, 0, 0);
-  if (window_bounds.y() < 0)
-    window_bounds.set_y(0);
   return window_bounds;
 }