Stop generating the [TOC] in the GN reference docs.

tools/gn/command_help.cc

 // Copyright (c) 2013 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 <algorithm>
 #include <iostream>
 
 #include "base/command_line.h"
 #include "tools/gn/args.h"
 #include "tools/gn/commands.h"
@@ skipping 74 matching lines @@
     PrintShortHelp(s.second.short_help);
 
   if (use_markdown)
     OutputString("\n```\n", DECORATION_NONE);
 }
 
 void PrintAllHelp() {
   const base::CommandLine* cmdline = base::CommandLine::ForCurrentProcess();
   if (cmdline->HasSwitch(switches::kMarkdown)) {
     OutputString("# GN Reference\n\n");
-    OutputString("[TOC]\n\n");
+
+    // TODO: https://code.google.com/p/gitiles/issues/detail?id=75
+    // Gitiles crashes when rendering the table of contents, so we must omit
+    // it until the bug is fixed.
+    // OutputString("[TOC]\n\n");
     OutputString("*This page is automatically generated from* "
                  "`gn help --markdown all`.\n\n");
   } else {
     PrintToplevelHelp();
   }
 
   for (const auto& s : switches::GetSwitches())
     PrintLongHelp(s.second.long_help);
 
   for (const auto& c: commands::GetCommands())
@@ skipping 134 matching lines @@
     return 0;
   }
 
   // No help on this.
   Err(Location(), "No help on \"" + what + "\".").PrintToStdout();
   RunHelp(std::vector<std::string>());
   return 1;
 }
 
 }  // namespace commands