Don't send file URLs for download protection server pings.

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 d9aed52be1d6cc2dfc79960c601f9527f6e3f64d..fd5748036374a4a95f9a5d68962fd90df1172ffd 100644
--- a/chrome/browser/safe_browsing/download_protection_service.cc
+++ b/chrome/browser/safe_browsing/download_protection_service.cc
@@ -358,7 +358,8 @@ class DownloadProtectionService::CheckClientDownloadRequest
       return;
     }
     const GURL& final_url = info_.download_url_chain.back();
-    if (!final_url.is_valid() || final_url.is_empty()) {
+    if (!final_url.is_valid() || final_url.is_empty() ||
+        !final_url.IsStandard() || final_url.SchemeIsFile()) {
       RecordImprovedProtectionStats(REASON_INVALID_URL);
       PostFinishTask(SAFE);
       return;