Only support left/right maximizing at 50% width when the --ash-enable-alternate-caption-button

ash/wm/window_util.cc

Index: ash/wm/window_util.cc
diff --git a/ash/wm/window_util.cc b/ash/wm/window_util.cc
index c3101c75e8dfe0af7a7d7904aff1047692d1d2a7..323da2bc68483ff3e84ed5f9be518f13ad59ec11 100644
--- a/ash/wm/window_util.cc
+++ b/ash/wm/window_util.cc
@@ -75,14 +75,6 @@ bool CanResizeWindow(const aura::Window* window) {
   return window->GetProperty(aura::client::kCanResizeKey);
 }
 
-bool CanSnapWindow(aura::Window* window) {
-  if (!CanResizeWindow(window))
-    return false;
-  // If a window has a maximum size defined, snapping may make it too big.
-  return window->delegate() ? window->delegate()->GetMaximumSize().IsEmpty() :
-                              true;
-}
-
 bool IsWindowNormal(const aura::Window* window) {
   return IsWindowStateNormal(window->GetProperty(aura::client::kShowStateKey));
 }