Warn users about potentially unwanted downloads.

chrome/browser/safe_browsing/download_protection_service.cc

 // 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.
 
 #include "chrome/browser/safe_browsing/download_protection_service.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/format_macros.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 399 matching lines @@
         reason = REASON_DOWNLOAD_NOT_SUPPORTED;
       } else if (response.verdict() == ClientDownloadResponse::DANGEROUS) {
         reason = REASON_DOWNLOAD_DANGEROUS;
         result = DANGEROUS;
       } else if (response.verdict() == ClientDownloadResponse::UNCOMMON) {
         reason = REASON_DOWNLOAD_UNCOMMON;
         result = UNCOMMON;
       } else if (response.verdict() == ClientDownloadResponse::DANGEROUS_HOST) {
         reason = REASON_DOWNLOAD_DANGEROUS_HOST;
         result = DANGEROUS_HOST;
+      } else if (
+          response.verdict() == ClientDownloadResponse::POTENTIALLY_UNWANTED) {
+        reason = REASON_DOWNLOAD_POTENTIALLY_UNWANTED;
+        result = POTENTIALLY_UNWANTED;
       } else {
         LOG(DFATAL) << "Unknown download response verdict: "
                     << response.verdict();
         reason = REASON_INVALID_RESPONSE_VERDICT;
       }
       DownloadFeedbackService::MaybeStorePingsForDownload(
           result, item_, client_download_request_data_, data);
     }
     // We don't need the fetcher anymore.
     fetcher_.reset();
@@ skipping 522 matching lines @@
   std::string url = kDownloadRequestUrl;
   std::string api_key = google_apis::GetAPIKey();
   if (!api_key.empty()) {
     base::StringAppendF(&url, "?key=%s",
                         net::EscapeQueryParamValue(api_key, true).c_str());
   }
   return url;
 }
 
 }  // namespace safe_browsing