Warn users about potentially unwanted downloads.

chrome/browser/download/chrome_download_manager_delegate.cc

Index: chrome/browser/download/chrome_download_manager_delegate.cc
diff --git a/chrome/browser/download/chrome_download_manager_delegate.cc b/chrome/browser/download/chrome_download_manager_delegate.cc
index 733134927b430bbdffcbc1ff18167b8746db0fd7..2c2c77544f2a5693e5aefa05cb29f7f9271835a5 100644
--- a/chrome/browser/download/chrome_download_manager_delegate.cc
+++ b/chrome/browser/download/chrome_download_manager_delegate.cc
@@ -525,23 +525,28 @@ void ChromeDownloadManagerDelegate::CheckClientDownloadDone(
   if (item->GetDangerType() == content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS ||
       item->GetDangerType() ==
       content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT) {
+    content::DownloadDangerType danger_type =
+        content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS;
     switch (result) {
       case DownloadProtectionService::SAFE:
         // Do nothing.
         break;
       case DownloadProtectionService::DANGEROUS:
-        item->OnContentCheckCompleted(
-            content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT);
+        danger_type = content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT;
         break;
       case DownloadProtectionService::UNCOMMON:
-        item->OnContentCheckCompleted(
-            content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT);
+        danger_type = content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT;
         break;
       case DownloadProtectionService::DANGEROUS_HOST:
-        item->OnContentCheckCompleted(
-            content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST);
+        danger_type = content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST;
+        break;
+      case DownloadProtectionService::POTENTIALLY_UNWANTED:
+        danger_type = content::DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED;
         break;
     }
+
+    if (danger_type != content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS)
+      item->OnContentCheckCompleted(danger_type);
   }
 
   SafeBrowsingState* state = static_cast<SafeBrowsingState*>(