[Download Notification] Refine retry logic when interrupted or cancelled

chrome/browser/download/download_commands.cc

 // Copyright 2015 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/download/download_commands.h"
 
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_item_model.h"
@@ skipping 196 matching lines @@
     }
     case LEARN_MORE_INTERRUPTED:
       GetBrowser()->OpenURL(content::OpenURLParams(
           GetLearnMoreURLForInterruptedDownload(), content::Referrer(),
           NEW_FOREGROUND_TAB, ui::PAGE_TRANSITION_LINK, false));
       break;
     case PAUSE:
       download_item_->Pause();
       break;
     case RESUME:
+    case RETRY:
       download_item_->Resume();
       break;
-    case RETRY:
-      if (download_item_->CanResume()) {
-        download_item_->Resume();
-      } else {
-        // TODO(yoshiki): Implement retry logic.
-      }
-      break;
   }
 }
 
 Browser* DownloadCommands::GetBrowser() const {
   Profile* profile =
       Profile::FromBrowserContext(download_item_->GetBrowserContext());
   chrome::ScopedTabbedBrowserDisplayer browser_displayer(
       profile, chrome::GetActiveDesktop());
   DCHECK(browser_displayer.browser());
   return browser_displayer.browser();
@@ skipping 13 matching lines @@
     is_adobe_pdf_reader_up_to_date =
         DownloadTargetDeterminer::IsAdobeReaderUpToDate();
   }
   return IsDownloadPdf() &&
          (IsAdobeReaderDefaultPDFViewer() ? is_adobe_pdf_reader_up_to_date
                                           : true);
 #elif defined(OS_MACOSX) || defined(OS_LINUX)
   return IsDownloadPdf();
 #endif
 }