Add cmdline switch for folks that really did want to run as root....

chrome/browser/browser_main_gtk.cc

 // Copyright (c) 2010 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/browser_main_gtk.h"
 
 #include <gtk/gtk.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ skipping 60 matching lines @@
   // We want to be sure to init NSPR on the main thread.
   base::EnsureNSPRInit();
 #endif
 }
 
 void BrowserMainPartsGtk::DetectRunningAsRoot() {
   if (geteuid() == 0) {
     const CommandLine& command_line = *CommandLine::ForCurrentProcess();
     gfx::GtkInitFromCommandLine(command_line);
 
+    if (!parsed_command_line().HasSwitch(switches::kUserDataDir))
+      return;

[Elliot Glaysher, 2011/03/07 23:40:16]

You should move this above the gtk initialization so the library isn't
initialized twice.

[Mike Belshe, 2011/03/08 16:34:40]

Done.

+
     // Get just enough of our resource machinery up so we can extract the
     // locale appropriate string. Note that the GTK implementation ignores the
     // passed in parameter and checks the LANG environment variables instead.
     ResourceBundle::InitSharedInstance("");
 
     std::string message = l10n_util::GetStringFUTF8(
             IDS_REFUSE_TO_RUN_AS_ROOT,
             l10n_util::GetStringUTF16(IDS_PRODUCT_NAME));
     GtkWidget* dialog = gtk_message_dialog_new(
         NULL,
         static_cast<GtkDialogFlags>(0),
         GTK_MESSAGE_ERROR,
         GTK_BUTTONS_CLOSE,
         "%s",
         message.c_str());
 
+    LOG(ERROR) << "Startup refusing to run as root.";
     message = l10n_util::GetStringFUTF8(
         IDS_REFUSE_TO_RUN_AS_ROOT_2,
         l10n_util::GetStringUTF16(IDS_PRODUCT_NAME));
     gtk_message_dialog_format_secondary_text(GTK_MESSAGE_DIALOG(dialog),
                                              "%s",
                                              message.c_str());
 
     message = l10n_util::GetStringUTF8(IDS_PRODUCT_NAME);
     gtk_window_set_title(GTK_WINDOW(dialog), message.c_str());
 
@@ skipping 70 matching lines @@
   ui::SetX11ErrorHandlers(BrowserX11ErrorHandler, BrowserX11IOErrorHandler);
 }
 
 #if !defined(OS_CHROMEOS)
 // static
 BrowserMainParts* BrowserMainParts::CreateBrowserMainParts(
     const MainFunctionParams& parameters) {
   return new BrowserMainPartsGtk(parameters);
 }
 #endif