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

chrome/browser/browser_main_gtk.cc

Index: chrome/browser/browser_main_gtk.cc
===================================================================
--- chrome/browser/browser_main_gtk.cc	(revision 77186)
+++ chrome/browser/browser_main_gtk.cc	(working copy)
@@ -78,6 +78,9 @@
     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.
@@ -94,6 +97,7 @@
         "%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));