[downloads] Remove DownloadManager::RemoveAllDownloads.

chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc

 // Copyright 2016 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 "base/strings/stringprintf.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/safe_browsing/download_protection_service.h"
 #include "chrome/browser/safe_browsing/safe_browsing_navigation_observer.h"
@@ skipping 119 matching lines @@
     // Set up default download path.
     browser()->profile()->GetPrefs()->SetFilePath(
         prefs::kDownloadDefaultDirectory, downloads_directory_.GetPath());
     browser()->profile()->GetPrefs()->SetFilePath(
         prefs::kSaveFileDefaultDirectory, downloads_directory_.GetPath());
     browser()->profile()->GetPrefs()->SetBoolean(prefs::kPromptForDownload,
                                                  false);
     content::DownloadManager* manager =
         content::BrowserContext::GetDownloadManager(browser()->profile());
     DownloadPrefs::FromDownloadManager(manager)->ResetAutoOpen();
-    manager->RemoveAllDownloads();
 
     return true;
   }
 
   void TearDownOnMainThread() override {
     // Cancel unfinished download if any.
     CancelDownloads();
     delete observer_;
   }
 
@@ skipping 1340 matching lines @@
           yesterday, embedded_test_server()->host_port_pair().host()));
   ASSERT_EQ(1U, ip_map->at(test_server_host).size());
   ClickTestLink("direct_download", 1, initial_url);
   EXPECT_EQ(1U, ip_map->at(test_server_host).size());
   EXPECT_EQ(embedded_test_server()->host_port_pair().host(),
             ip_map->at(test_server_host).back().ip);
   EXPECT_NE(yesterday, ip_map->at(test_server_host).front().timestamp);
 }
 
 }  // namespace safe_browsing