Revert of Convert //net and //chromecast to std::unordered_*

net/url_request/url_request_filter.h

Index: net/url_request/url_request_filter.h
diff --git a/net/url_request/url_request_filter.h b/net/url_request/url_request_filter.h
index 627b962843e4a96a41eb8a6c07b757b54887eeab..d72aa752aaeb5bd09a56e522a6da7a2e1917e8f3 100644
--- a/net/url_request/url_request_filter.h
+++ b/net/url_request/url_request_filter.h
@@ -6,8 +6,9 @@
 
 #include <map>
 #include <string>
-#include <unordered_map>
 
+#include "base/containers/hash_tables.h"
+#include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/net_export.h"
@@ -75,7 +76,7 @@
                                           scoped_ptr<URLRequestInterceptor>>;
   // URL -> URLRequestInterceptor
   using URLInterceptorMap =
-      std::unordered_map<std::string, scoped_ptr<URLRequestInterceptor>>;
+      base::ScopedPtrHashMap<std::string, scoped_ptr<URLRequestInterceptor>>;
 
   URLRequestFilter();
   ~URLRequestFilter() override;