Fix the Visual Studio 2005 build.

chrome/browser/download/download_browsertest.cc

 // Copyright (c) 2010 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/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/scoped_temp_dir.h"
 #include "base/test/test_file_util.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 104 matching lines @@
     // finished_downloads_ (done by OnDownloadUpdated).
     std::vector<DownloadItem*> downloads;
     download_manager_->SearchDownloads(string16(), &downloads);
 
     std::vector<DownloadItem*>::iterator it = downloads.begin();
     for (; it != downloads.end(); ++it) {
       OnDownloadUpdated(*it);  // Safe to call multiple times; checks state.
 
       std::set<DownloadItem*>::const_iterator
           finished_it(finished_downloads_.find(*it));
-      std::set<DownloadItem*>::const_iterator
+      std::set<DownloadItem*>::iterator
           observed_it(downloads_observed_.find(*it));
 
       // If it isn't finished and we're aren't observing it, start.
       if (finished_it == finished_downloads_.end() &&
           observed_it == downloads_observed_.end()) {
         (*it)->AddObserver(this);
         downloads_observed_.insert(*it);
         continue;
       }
 
@@ skipping 193 matching lines @@
       browser(), URLRequestMockHTTPJob::GetMockUrl(file));
   observer->WaitForFinished();
 
   // Download should not be finished; check state.
   EXPECT_TRUE(observer->select_file_dialog_seen());
   EXPECT_EQ(1, browser()->tab_count());
   EXPECT_FALSE(browser()->window()->IsDownloadShelfVisible());
 }
 
 }  // namespace