Wire up download attribution enable finch experiment

chrome/browser/safe_browsing/download_protection_service_unittest.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/safe_browsing/download_protection_service.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
@@ skipping 413 matching lines @@
       const base::FilePath& tmp_full_path,
       const base::FilePath& final_full_path) {
     url_chain_.clear();
     for (std::string item: url_chain_items)
       url_chain_.push_back(GURL(item));
     referrer_ = GURL(referrer_url);
     tmp_path_ = tmp_full_path;
     final_path_ = final_full_path;
     hash_ = "hash";
 
+    if (url_chain_.size() > 0) {
+      EXPECT_CALL(*item, GetURL()).WillRepeatedly(ReturnRef(url_chain_.back()));
+    } else{
+      GURL empty_url;
+      EXPECT_CALL(*item, GetURL()).WillRepeatedly(ReturnRef(empty_url));
+    }
     EXPECT_CALL(*item, GetFullPath()).WillRepeatedly(ReturnRef(tmp_path_));
     EXPECT_CALL(*item, GetTargetFilePath())
         .WillRepeatedly(ReturnRef(final_path_));
     EXPECT_CALL(*item, GetUrlChain()).WillRepeatedly(ReturnRef(url_chain_));
     EXPECT_CALL(*item, GetReferrerUrl()).WillRepeatedly(ReturnRef(referrer_));
     EXPECT_CALL(*item, GetTabUrl())
         .WillRepeatedly(ReturnRef(GURL::EmptyGURL()));
     EXPECT_CALL(*item, GetTabReferrerUrl())
         .WillRepeatedly(ReturnRef(GURL::EmptyGURL()));
     EXPECT_CALL(*item, GetHash()).WillRepeatedly(ReturnRef(hash_));
@@ skipping 1870 matching lines @@
       &item, base::Bind(&DownloadProtectionServiceTest::CheckDoneCallback,
                         base::Unretained(this), run_loop.QuitClosure()));
   run_loop.Run();
 
   EXPECT_FALSE(HasClientDownloadRequest());
   // Overriden by flag:
   EXPECT_TRUE(IsResult(DownloadProtectionService::DANGEROUS));
 }
 
 }  // namespace safe_browsing