DevTools: Display a warning when trying to open untrusted frontend

chrome/browser/devtools/devtools_window.cc

Index: chrome/browser/devtools/devtools_window.cc
diff --git a/chrome/browser/devtools/devtools_window.cc b/chrome/browser/devtools/devtools_window.cc
index 8c13a6d83736a0e38608abf5d782f9c9a0a25d6a..83fa9b4729dfab3520745e5df12b719638d58a26 100644
--- a/chrome/browser/devtools/devtools_window.cc
+++ b/chrome/browser/devtools/devtools_window.cc
@@ -622,6 +622,9 @@ GURL DevToolsWindow::GetDevToolsURL(Profile* profile,
                                     DevToolsDockSide dock_side,
                                     bool shared_worker_frontend,
                                     bool external_frontend) {
+  if (base_url.SchemeIs("data"))
+    return base_url;
+
   std::string frontend_url(
       base_url.is_empty() ? chrome::kChromeUIDevToolsURL : base_url.spec());
   ThemeService* tp = ThemeServiceFactory::GetForProfile(profile);