A blind fix for Bug 70870

It seems r72539 <http://crrev.com/72539> changed ui::GetXWindowStack() so it returns false if XGetWindowProperty() returns 0 (Success). This change just compares the return value of XGetWindowProperty() with Success as the function did before r72539.

BUG=70870
TEST=make the "Linux Tests (valgrind)(1)" bot green.
Review URL: http://codereview.chromium.org/6350017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72608 0039d316-1c4b-4281-b951-d872f2087c98

ui/base/x/x11_util.cc

@@ -441,13 +441,13 @@ bool GetXWindowStack(Window window, std::vector<XID>* windows) {
   int format;
   unsigned long count;
   unsigned char *data = NULL;
-  if (!GetProperty(window,
-                   "_NET_CLIENT_LIST_STACKING",
-                   ~0L,
-                   &type,
-                   &format,
-                   &count,
-                   &data)) {
+  if (GetProperty(window,
+                  "_NET_CLIENT_LIST_STACKING",
+                  ~0L,
+                  &type,
+                  &format,
+                  &count,
+                  &data) != Success) {
     return false;
   }