Revert of ONC: Fix handling of invalid proxy scheme.

chromeos/network/onc/onc_utils.cc

Index: chromeos/network/onc/onc_utils.cc
diff --git a/chromeos/network/onc/onc_utils.cc b/chromeos/network/onc/onc_utils.cc
index 4f956c4167bcdb05d68e844f09616f40cd46418e..a696ca5984855e530b1cfc9653571f5d1762193e 100644
--- a/chromeos/network/onc/onc_utils.cc
+++ b/chromeos/network/onc/onc_utils.cc
@@ -36,7 +36,6 @@
 #include "components/prefs/pref_service.h"
 #include "components/proxy_config/proxy_config_dictionary.h"
 #include "components/signin/core/account_id/account_id.h"
-#include "components/url_formatter/url_fixer.h"
 #include "components/user_manager/user.h"
 #include "components/user_manager/user_manager.h"
 #include "crypto/encryptor.h"
@@ -931,9 +930,9 @@
     std::string pac_url;
     onc_proxy_settings.GetStringWithoutPathExpansion(::onc::proxy::kPAC,
                                                      &pac_url);
-    GURL url(url_formatter::FixupURL(pac_url, std::string()));
-    proxy_dict.reset(ProxyConfigDictionary::CreatePacScript(
-        url.is_valid() ? url.spec() : std::string(), false));
+    GURL url(pac_url);
+    DCHECK(url.is_valid()) << "Invalid URL in ProxySettings.PAC";
+    proxy_dict.reset(ProxyConfigDictionary::CreatePacScript(url.spec(), false));
   } else if (type == ::onc::proxy::kManual) {
     const base::DictionaryValue* manual_dict = nullptr;
     onc_proxy_settings.GetDictionaryWithoutPathExpansion(::onc::proxy::kManual,