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

tools/gn/command_help.cc

Index: tools/gn/command_help.cc
diff --git a/tools/gn/command_help.cc b/tools/gn/command_help.cc
index fda8269664b337a62d9cbcb4cec369267b3f430d..7679b1773be2bcfcbf69fd5aa38ca31f98242cd4 100644
--- a/tools/gn/command_help.cc
+++ b/tools/gn/command_help.cc
@@ -92,7 +92,11 @@ 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 {