DevTools: [regression] remote debugging to a tcp port does not work via chrome:inspect

chrome/browser/ui/webui/devtools_ui.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/webui/devtools_ui.h"
 
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_util.h"
@@ skipping 24 matching lines @@
 
 namespace {
 
 std::string PathWithoutParams(const std::string& path) {
   return GURL(std::string("chrome-devtools://devtools/") + path)
       .path().substr(1);
 }
 
 const char kHttpNotFound[] = "HTTP/1.1 404 Not Found\n\n";
 
-#if BUILDFLAG(DEBUG_DEVTOOLS)
-// Local frontend url provided by InspectUI.
-const char kFallbackFrontendURL[] =
-    "chrome-devtools://devtools/bundled/inspector.html";
-#else
-// URL causing the DevTools window to display a plain text warning.
-const char kFallbackFrontendURL[] =
-    "data:text/plain,Cannot load DevTools frontend from an untrusted origin";
-#endif  // BUILDFLAG(DEBUG_DEVTOOLS)
-
-
 // DevToolsDataSource ---------------------------------------------------------
 
 std::string GetMimeTypeForPath(const std::string& path) {
   std::string filename = PathWithoutParams(path);
   if (base::EndsWith(filename, ".html", base::CompareCase::INSENSITIVE_ASCII)) {
     return "text/html";
   } else if (base::EndsWith(filename, ".css",
                             base::CompareCase::INSENSITIVE_ASCII)) {
     return "text/css";
   } else if (base::EndsWith(filename, ".js",
@@ skipping 264 matching lines @@
 }  // namespace
 
 // DevToolsUI -----------------------------------------------------------------
 
 // static
 GURL DevToolsUI::GetProxyURL(const std::string& frontend_url) {
   GURL url(frontend_url);
   if (url.scheme() == content::kChromeDevToolsScheme &&
       url.host() == chrome::kChromeUIDevToolsHost)
     return GURL();
-
   if (!url.is_valid() || url.host() != kRemoteFrontendDomain)
-    return GURL(kFallbackFrontendURL);
+    return GURL();
   return GURL(base::StringPrintf("%s://%s/%s/%s",
               content::kChromeDevToolsScheme,
               chrome::kChromeUIDevToolsHost,
               chrome::kChromeUIDevToolsRemotePath,
               url.path().substr(1).c_str()));
 }
 
 // static
 GURL DevToolsUI::GetRemoteBaseURL() {
   return GURL(base::StringPrintf(
@@ skipping 14 matching lines @@
   if (!profile->IsOffTheRecord())
     return;
   GURL url = web_ui->GetWebContents()->GetVisibleURL();
   GURL site = content::SiteInstance::GetSiteForURL(profile, url);
   content::BrowserContext::GetStoragePartitionForSite(profile, site)->
       GetFileSystemContext()->EnableTemporaryFileSystemInIncognito();
 }
 
 DevToolsUI::~DevToolsUI() {
 }