Delete the GTK+ port of Chrome.

chrome/browser/process_singleton_linux.cc

Index: chrome/browser/process_singleton_linux.cc
diff --git a/chrome/browser/process_singleton_linux.cc b/chrome/browser/process_singleton_linux.cc
index 8038afe45e44da34a572e7532aa1565080819217..54d7db296f329d29016c8f5ba35d64bbefadd778 100644
--- a/chrome/browser/process_singleton_linux.cc
+++ b/chrome/browser/process_singleton_linux.cc
@@ -82,9 +82,6 @@
 #include "net/base/net_util.h"
 #include "ui/base/l10n/l10n_util.h"
 
-#if defined(TOOLKIT_GTK)
-#include <gdk/gdk.h>
-#endif
 #if defined(TOOLKIT_VIEWS) && !defined(OS_CHROMEOS)
 #include "ui/views/linux_ui/linux_ui.h"
 #endif
@@ -815,11 +812,6 @@ ProcessSingleton::NotifyResult ProcessSingleton::NotifyOtherProcessWithTimeout(
     // The other process is shutting down, it's safe to start a new process.
     return PROCESS_NONE;
   } else if (strncmp(buf, kACKToken, arraysize(kACKToken) - 1) == 0) {
-#if defined(TOOLKIT_GTK)
-    // Notify the window manager that we've started up; if we do not open a
-    // window, GTK will not automatically call this for us.
-    gdk_notify_startup_complete();
-#endif
 #if defined(TOOLKIT_VIEWS) && !defined(OS_CHROMEOS)
     // Likely NULL in unit tests.
     views::LinuxUI* linux_ui = views::LinuxUI::instance();