Warn users about potentially unwanted downloads.

chrome/browser/safe_browsing/download_protection_service.cc

Index: chrome/browser/safe_browsing/download_protection_service.cc
diff --git a/chrome/browser/safe_browsing/download_protection_service.cc b/chrome/browser/safe_browsing/download_protection_service.cc
index 2c5f5901c2a16f35211e953f68a0f5a351bfe2ab..62c12fa4936b3c0a6cfdd4111618eff9c09ac359 100644
--- a/chrome/browser/safe_browsing/download_protection_service.cc
+++ b/chrome/browser/safe_browsing/download_protection_service.cc
@@ -417,6 +417,10 @@ class DownloadProtectionService::CheckClientDownloadRequest
       } 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();
@@ -864,8 +868,12 @@ void DownloadProtectionService::RequestFinished(
 void DownloadProtectionService::ShowDetailsForDownload(
     const content::DownloadItem& item,
     content::PageNavigator* navigator) {
+  GURL learn_more_url(chrome::kDownloadScanningLearnMoreURL);
+  if (item.GetDangerType() ==
+      content::DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED)
+    learn_more_url = GURL(chrome::kDownloadPotentiallyUnwantedLearnMoreURL);
   navigator->OpenURL(
-      content::OpenURLParams(GURL(chrome::kDownloadScanningLearnMoreURL),
+      content::OpenURLParams(learn_more_url,
                              content::Referrer(),
                              NEW_FOREGROUND_TAB,
                              content::PAGE_TRANSITION_LINK,