Linux: Fix Valgrind error in VisitedLinkEventsTest.Coalescense.

chrome/browser/gtk/browser_window_gtk.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/gtk/browser_window_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 #include <X11/XF86keysym.h>
 
 #include "app/resource_bundle.h"
@@ skipping 1176 matching lines @@
 }
 
 // static
 GtkWindow* BrowserWindowGtk::GetBrowserWindowForXID(XID xid) {
   return BrowserWindowGtk::xid_map_.find(xid)->second;
 }
 
 // static
 void BrowserWindowGtk::RegisterUserPrefs(PrefService* prefs) {
   bool custom_frame_default = false;
-  if (!prefs->HasPrefPath(prefs::kUseCustomChromeFrame))
+  // Avoid checking the window manager if we're not connected to an X server (as
+  // is the case in Valgrind tests).
+  if (x11_util::XDisplayExists() &&
+      !prefs->HasPrefPath(prefs::kUseCustomChromeFrame)) {
     custom_frame_default = GetCustomFramePrefDefault();
+  }
   prefs->RegisterBooleanPref(
       prefs::kUseCustomChromeFrame, custom_frame_default);
 }
 
 void BrowserWindowGtk::SetGeometryHints() {
   // Allow the user to resize us arbitrarily small.
   GdkGeometry geometry;
   geometry.min_width = 1;
   geometry.min_height = 1;
   gtk_window_set_geometry_hints(window_, NULL, &geometry, GDK_HINT_MIN_SIZE);
@@ skipping 553 matching lines @@
   // are taken from the WMs' source code.
   return (wm_name == "Blackbox" ||
           wm_name == "compiz" ||
           wm_name == "e16" ||  // Enlightenment DR16
           wm_name == "Fluxbox" ||
           wm_name == "KWin" ||
           wm_name == "Metacity" ||
           wm_name == "Openbox" ||
           wm_name == "Xfwm4");
 }