Get chrome:// dev tool urls hooked up in content_shell.

content/shell/shell_content_client.cc

Index: content/shell/shell_content_client.cc
===================================================================
--- content/shell/shell_content_client.cc	(revision 133033)
+++ content/shell/shell_content_client.cc	(working copy)
@@ -27,6 +27,11 @@
     webkit::npapi::PluginList* plugin_list) {
 }
 
+void ShellContentClient::AddAdditionalSchemes(
+    std::vector<std::string>* standard_schemes,
+    std::vector<std::string>* savable_schemes) {
+}
+
 bool ShellContentClient::HasWebUIScheme(const GURL& url) const {
   // There are no WebUI URLs in content_shell.
   return false;