Change AuthenticatingURLLoader to be a URLLoaderInterceptor

shell/context.cc

Index: shell/context.cc
diff --git a/shell/context.cc b/shell/context.cc
index a926919d0f8482b8c18d291e22d177f90ed6781f..40abac585d478ba946c7a3814c78ffd2cdd4c944 100644
--- a/shell/context.cc
+++ b/shell/context.cc
@@ -31,7 +31,6 @@
 #include "services/tracing/tracing.mojom.h"
 #include "shell/application_manager/application_loader.h"
 #include "shell/application_manager/application_manager.h"
-#include "shell/authenticating_url_loader_loader.h"
 #include "shell/background_application_loader.h"
 #include "shell/command_line_util.h"
 #include "shell/filename_util.h"
@@ -279,12 +278,6 @@ bool Context::InitWithPaths(const base::FilePath& shell_child_path) {
           "url_response_disk_cache", base::MessageLoop::TYPE_DEFAULT)),
       GURL("mojo:url_response_disk_cache"));
 
-  application_manager()->SetLoaderForURL(
-      make_scoped_ptr(new BackgroundApplicationLoader(
-          make_scoped_ptr(new AuthenticatingURLLoaderLoader()),
-          "authenticating_url_loader", base::MessageLoop::TYPE_DEFAULT)),
-      GURL("mojo:authenticating_url_loader"));
-
   EnsureEmbedderIsInitialized();
   task_runners_.reset(
       new TaskRunners(base::MessageLoop::current()->message_loop_proxy()));