Fix download danger prompt buttons/actions.

chrome/browser/download/download_danger_prompt.h

Index: chrome/browser/download/download_danger_prompt.h
diff --git a/chrome/browser/download/download_danger_prompt.h b/chrome/browser/download/download_danger_prompt.h
index 218d388e4b921e24d7eacd08f2025136a9e73f24..4301ea6958a7e51b7b6bcb58cc292d130a817b45 100644
--- a/chrome/browser/download/download_danger_prompt.h
+++ b/chrome/browser/download/download_danger_prompt.h
@@ -25,8 +25,11 @@ 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;