Rewrite std::string("") to std::string(), Linux edition.

chrome/browser/download/download_browsertest.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 <sstream>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 1637 matching lines @@
 
   EXPECT_EQ(1, browser()->tab_strip_model()->count());
   // Download shelf should close. Download panel stays open on ChromeOS.
   EXPECT_FALSE(browser()->window()->IsDownloadShelfVisible());
 
   CheckDownload(browser(), file, file);
 }
 
 IN_PROC_BROWSER_TEST_F(DownloadTest, DownloadHistoryCheck) {
   GURL download_url(URLRequestSlowDownloadJob::kKnownSizeUrl);
-  base::FilePath file(net::GenerateFileName(download_url, "", "", "", "", ""));
+  base::FilePath file(net::GenerateFileName(download_url,
+                                            std::string(),
+                                            std::string(),
+                                            std::string(),
+                                            std::string(),
+                                            std::string()));
 
   // We use the server so that we can get a redirect and test url_chain
   // persistence.
   ASSERT_TRUE(test_server()->Start());
   GURL redirect_url = test_server()->GetURL(
       "server-redirect?" + download_url.spec());
 
   // Download the url and wait until the object has been stored.
   base::Time start(base::Time::Now());
   HistoryObserver observer(browser()->profile());
@@ skipping 951 matching lines @@
   CheckDownloadStates(1, DownloadItem::COMPLETE);
 
   // Validate that the correct file was downloaded.
   GetDownloads(browser(), &download_items);
   ASSERT_EQ(1u, download_items.size());
   ASSERT_EQ(test_server()->GetURL("echoheader?Referer"),
             download_items[0]->GetOriginalUrl());
 
   // Check that the file contains the expected referrer.
   base::FilePath file(download_items[0]->GetFullPath());
-  std::string expected_contents = test_server()->GetURL("").spec();
+  std::string expected_contents = test_server()->GetURL(std::string()).spec();
   ASSERT_TRUE(VerifyFile(file, expected_contents, expected_contents.length()));
 }
 
 IN_PROC_BROWSER_TEST_F(DownloadTest, HiddenDownload) {
   base::FilePath file(FILE_PATH_LITERAL("download-test1.lib"));
   GURL url(URLRequestMockHTTPJob::GetMockUrl(file));
 
   scoped_refptr<DownloadManager> download_manager =
       DownloadManagerForBrowser(browser());
   scoped_ptr<content::DownloadTestObserver> observer(
@@ skipping 281 matching lines @@
   scoped_ptr<content::DownloadTestObserver> observer(
       DangerousDownloadWaiter(
           browser(), 1,
           content::DownloadTestObserver::ON_DANGEROUS_DOWNLOAD_DENY));
   ui_test_utils::NavigateToURL(browser(), url);
   observer->WaitForFinished();
   EXPECT_EQ(1u, observer->NumDownloadsSeenInState(DownloadItem::CANCELLED));
   EXPECT_EQ(1u, observer->NumDangerousDownloadsSeen());
   EXPECT_FALSE(browser()->window()->IsDownloadShelfVisible());
 }