Apply Referrer-Policy header when following redirects

ios/web/public/referrer_util_unittest.cc

 // Copyright 2013 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 "ios/web/public/referrer_util.h"
 
 #include "base/macros.h"
 #include "ios/web/public/referrer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
@@ skipping 146 matching lines @@
                     policy == ReferrerPolicyNever ||
                     policy == ReferrerPolicyOrigin);
         break;
       case net::URLRequest::
           CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE:
         // This corresponds directly to ReferrerPolicyNoReferrerWhenDowngrade,
         // which is also how Default works on iOS.
         EXPECT_TRUE(policy == ReferrerPolicyDefault ||
                     policy == ReferrerPolicyNoReferrerWhenDowngrade);
         break;
+      case net::URLRequest::MAX_REFERRER_POLICY:
+        FAIL();
+        break;
     }
   }
 }
 
 // Tests that all the strings corresponding to web::ReferrerPolicy values are
 // correctly handled.
 TEST(ReferrerUtilTest, PolicyFromString) {
   // The ordering here must match web::ReferrerPolicy; this makes the test
   // simpler, at the cost of needing to re-order if the enum is re-ordered.
   const char* const kPolicyStrings[] = {
@@ skipping 23 matching lines @@
   EXPECT_EQ(ReferrerPolicyNoReferrerWhenDowngrade,
             ReferrerPolicyFromString("default"));
   EXPECT_EQ(ReferrerPolicyAlways, ReferrerPolicyFromString("always"));
 
   // Test that invalid values map to Never.
   EXPECT_EQ(ReferrerPolicyNever, ReferrerPolicyFromString(""));
   EXPECT_EQ(ReferrerPolicyNever, ReferrerPolicyFromString("made-up"));
 }
 
 }  // namespace web