linux_aura: Default to system titlebars under some window managers.

chrome/browser/ui/gtk/browser_window_gtk.cc

Index: chrome/browser/ui/gtk/browser_window_gtk.cc
diff --git a/chrome/browser/ui/gtk/browser_window_gtk.cc b/chrome/browser/ui/gtk/browser_window_gtk.cc
index 5f20f14e781b282c242d33b220d13f12f5401f29..cb1ceaf6c809434c61f1d29aad6677b8bd334418 100644
--- a/chrome/browser/ui/gtk/browser_window_gtk.cc
+++ b/chrome/browser/ui/gtk/browser_window_gtk.cc
@@ -1528,7 +1528,7 @@ void BrowserWindowGtk::RegisterProfilePrefs(
   // Avoid checking the window manager if we're not connected to an X server (as
   // is the case in Valgrind tests).
   if (ui::XDisplayExists())
-    custom_frame_default = GetCustomFramePrefDefault();
+    custom_frame_default = ui::GetCustomFramePrefDefault();
 
   registry->RegisterBooleanPref(
       prefs::kUseCustomChromeFrame,
@@ -2355,27 +2355,6 @@ void BrowserWindowGtk::OnUseCustomChromeFrameChanged() {
 }
 
 // static
-bool BrowserWindowGtk::GetCustomFramePrefDefault() {
-  // Ideally, we'd use the custom frame by default and just fall back on using
-  // system decorations for the few (?) tiling window managers where the custom
-  // frame doesn't make sense (e.g. awesome, ion3, ratpoison, xmonad, etc.) or
-  // other WMs where it has issues (e.g. Fluxbox -- see issue 19130).  The EWMH
-  // _NET_SUPPORTING_WM property makes it easy to look up a name for the current
-  // WM, but at least some of the WMs in the latter group don't set it.
-  // Instead, we default to using system decorations for all WMs and
-  // special-case the ones where the custom frame should be used.
-  ui::WindowManagerName wm_type = ui::GuessWindowManager();
-  return (wm_type == ui::WM_BLACKBOX ||
-          wm_type == ui::WM_COMPIZ ||
-          wm_type == ui::WM_ENLIGHTENMENT ||
-          wm_type == ui::WM_METACITY ||
-          wm_type == ui::WM_MUFFIN ||
-          wm_type == ui::WM_MUTTER ||
-          wm_type == ui::WM_OPENBOX ||
-          wm_type == ui::WM_XFWM4);
-}
-
-// static
 BrowserWindow* BrowserWindow::CreateBrowserWindow(Browser* browser) {
   BrowserWindowGtk* browser_window_gtk = new BrowserWindowGtk(browser);
   browser_window_gtk->Init();