Fix download danger prompt buttons/actions.

chrome/browser/download/download_danger_prompt.h

 // 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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_DANGER_PROMPT_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_DANGER_PROMPT_H_
 
 #include "base/callback_forward.h"
 
 class GURL;
 
 namespace content {
 class DownloadItem;
 class WebContents;
 }
 
 // Prompts the user for whether to Keep a dangerous DownloadItem using native
 // UI. This prompt is invoked by the DownloadsDOMHandler when the user wants to
 // accept a dangerous download. Having a native dialog intervene during the this
 // workflow means that the chrome://downloads page no longer has the privilege
 // to accept a dangerous download from script without user intervention. This
 // step is necessary to prevent a malicious script form abusing such a
 // privilege.
 class DownloadDangerPrompt {
  public:
   // Actions resulting from showing the danger prompt.
   enum Action {
+    // The user chose to proceed down the dangerous path.
     ACCEPT,
+    // The user chose not to proceed down the dangerous path.
     CANCEL,
+    // The user dismissed the dialog without making an explicit choice.
     DISMISS,
   };
   typedef base::Callback<void(Action)> OnDone;
 
   // Return a new self-deleting DownloadDangerPrompt. |accepted| or |canceled|
   // will be run when the the respective action is invoked. |canceled| may also
   // be called when |item| is either no longer dangerous or no longer in
   // progress, or if the tab corresponding to |web_contents| is
   // closing. The returned DownloadDangerPrompt* is only used for testing. The
   // caller does not own the object and receive no guarantees about lifetime.
@@ skipping 18 matching lines @@
   static void SendSafeBrowsingDownloadRecoveryReport(
       bool did_proceed,
       const content::DownloadItem& download);
 
   // Records UMA stats for a download danger prompt event.
   static void RecordDownloadDangerPrompt(bool did_proceed,
                                          const content::DownloadItem& download);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_DANGER_PROMPT_H_