Make the maximize button more easily hittable when there is a huge amount of tabs present

ash/wm/frame_painter.cc

Index: ash/wm/frame_painter.cc
diff --git a/ash/wm/frame_painter.cc b/ash/wm/frame_painter.cc
index 7b8b25c17c2d5aa8e75124c5e17266537607aec4..0f613c8ff39c17e1f42a2118ae87c8d195066370 100644
--- a/ash/wm/frame_painter.cc
+++ b/ash/wm/frame_painter.cc
@@ -326,8 +326,8 @@ gfx::Rect FramePainter::GetWindowBoundsForClientBounds(
                    client_bounds.height() + top_height + kBorderThickness);
 }
 
-int FramePainter::NonClientHitTest(views::NonClientFrameView* view,
-                                   const gfx::Point& point) {
+int FramePainter::NonClientHitTest(const views::NonClientFrameView* view,
+                                   const gfx::Point& point) const {
   gfx::Rect expanded_bounds = view->bounds();
   int outside_bounds = kResizeOutsideBoundsSize;