Revise about: and chrome: url handling.

chrome/browser/ui/webui/devtools_ui.cc

Index: chrome/browser/ui/webui/devtools_ui.cc
diff --git a/chrome/browser/ui/webui/devtools_ui.cc b/chrome/browser/ui/webui/devtools_ui.cc
index 4782c53225d24a8d7a8ec3bbe68798c0c5f5a186..4b4e5f2d60a15ad8ba151638f613201fa5b01c96 100644
--- a/chrome/browser/ui/webui/devtools_ui.cc
+++ b/chrome/browser/ui/webui/devtools_ui.cc
@@ -47,6 +47,11 @@ DevToolsDataSource::DevToolsDataSource()
 void DevToolsDataSource::StartDataRequest(const std::string& path,
                                           bool is_incognito,
                                           int request_id) {
+  if (path.empty()) {
+    SendResponse(request_id, NULL);
+    return;
+  }
+
   std::string filename = PathWithoutParams(path);
 
   int resource_id = -1;
@@ -79,7 +84,6 @@ std::string DevToolsDataSource::GetMimeType(const std::string& path) const {
   } else if (EndsWith(filename, ".gif", false)) {
     return "image/gif";
   }
-  NOTREACHED();
   return "text/plain";
 }