[Downloads] Introduce GUIDs for downloads.

components/history/core/test/history_backend_db_base_test.cc

Index: components/history/core/test/history_backend_db_base_test.cc
diff --git a/components/history/core/test/history_backend_db_base_test.cc b/components/history/core/test/history_backend_db_base_test.cc
index 7a0c1101c1fdfadc9d5d01705a03d4f08a3e8594..daecc813b3738ad9148c551bfdb03efc6df38cbc 100644
--- a/components/history/core/test/history_backend_db_base_test.cc
+++ b/components/history/core/test/history_backend_db_base_test.cc
@@ -117,30 +117,20 @@ void HistoryBackendDBBaseTest::DeleteBackend() {
 }
 
 bool HistoryBackendDBBaseTest::AddDownload(uint32_t id,
+                                           const std::string& guid,
                                            DownloadState state,
                                            base::Time time) {
   std::vector<GURL> url_chain;
   url_chain.push_back(GURL("foo-url"));
 
-  DownloadRow download(base::FilePath(FILE_PATH_LITERAL("current-path")),
-                       base::FilePath(FILE_PATH_LITERAL("target-path")),
-                       url_chain,
-                       GURL("http://referrer.com/"),
-                       "application/vnd.oasis.opendocument.text",
-                       "application/octet-stream",
-                       time,
-                       time,
-                       std::string(),
-                       std::string(),
-                       0,
-                       512,
-                       state,
-                       DownloadDangerType::NOT_DANGEROUS,
-                       kTestDownloadInterruptReasonNone,
-                       id,
-                       false,
-                       "by_ext_id",
-                       "by_ext_name");
+  DownloadRow download(
+      base::FilePath(FILE_PATH_LITERAL("current-path")),
+      base::FilePath(FILE_PATH_LITERAL("target-path")), url_chain,
+      GURL("http://referrer.com/"), std::string(),
+      "application/vnd.oasis.opendocument.text", "application/octet-stream",
+      time, time, std::string(), std::string(), 0, 512, state,
+      DownloadDangerType::NOT_DANGEROUS, kTestDownloadInterruptReasonNone,
+      std::string(), id, guid, false, "by_ext_id", "by_ext_name");
   return db_->CreateDownload(download);
 }