Fixes _NET_ACTIVE_WINDOW support check in order to not always return no.

ui/views/widget/desktop_aura/x11_desktop_handler.cc

Index: ui/views/widget/desktop_aura/x11_desktop_handler.cc
diff --git a/ui/views/widget/desktop_aura/x11_desktop_handler.cc b/ui/views/widget/desktop_aura/x11_desktop_handler.cc
index 8125611ef088df54d5033f6ee08b7f1069d90cf7..e754f74640bed9658823efa85e279b2f8bc627f6 100644
--- a/ui/views/widget/desktop_aura/x11_desktop_handler.cc
+++ b/ui/views/widget/desktop_aura/x11_desktop_handler.cc
@@ -55,17 +55,10 @@ X11DesktopHandler::X11DesktopHandler()
                attr.your_event_mask | PropertyChangeMask |
                StructureNotifyMask | SubstructureNotifyMask);
 
-  std::vector<Atom> atoms;
-  if (ui::GetAtomArrayProperty(x_root_window_, "_NET_ACTIVE_WINDOW", &atoms)) {
-    Atom active_window = atom_cache_.GetAtom("_NET_ACTIVE_WINDOW");
-    for (std::vector<Atom>::iterator iter = atoms.begin(); iter != atoms.end();
-         ++iter) {
-      if (*(iter) == active_window) {
-        wm_supports_active_window_ = true;
-        break;
-      }
-    }
-  }
+  ::Window active_window;
+  wm_supports_active_window_ =
+    ui::GetXIDProperty(x_root_window_, "_NET_ACTIVE_WINDOW", &active_window) &&
+    active_window;
 }
 
 X11DesktopHandler::~X11DesktopHandler() {
@@ -136,14 +129,14 @@ bool X11DesktopHandler::Dispatch(const base::NativeEvent& event) {
   // Check for a change to the active window.
   switch (event->type) {
     case PropertyNotify: {
-      ::Atom active_window = atom_cache_.GetAtom("_NET_ACTIVE_WINDOW");
+      ::Atom active_window_atom = atom_cache_.GetAtom("_NET_ACTIVE_WINDOW");
 
       if (event->xproperty.window == x_root_window_ &&
-          event->xproperty.atom == active_window) {
-        int window;
-        if (ui::GetIntProperty(x_root_window_, "_NET_ACTIVE_WINDOW", &window) &&
+          event->xproperty.atom == active_window_atom) {
+        ::Window window;
+        if (ui::GetXIDProperty(x_root_window_, "_NET_ACTIVE_WINDOW", &window) &&
             window) {
-          OnActiveWindowChanged(static_cast< ::Window>(window));
+          OnActiveWindowChanged(window);
         }
       }
       break;