Parse the download server response.

chrome/common/safe_browsing/csd.proto

Index: chrome/common/safe_browsing/csd.proto
diff --git a/chrome/common/safe_browsing/csd.proto b/chrome/common/safe_browsing/csd.proto
index 1811c76488c7522c3f0e49fd018e09ddfe0658b1..a95bad8a0f17125c0b89f5b9bf33cfe3f2748ec1 100644
--- a/chrome/common/safe_browsing/csd.proto
+++ b/chrome/common/safe_browsing/csd.proto
@@ -146,3 +146,14 @@ message ClientDownloadRequest {
   // True if the download was user initiated.
   optional bool user_initiated = 6;
 }
+
+message ClientDownloadResponse {
+  enum Verdict {
+    // Download is considered safe.
+    SAFE = 0;
+    // Download is considered dangerous.  Chrome should show a warning to the
+    // user.
+    DANGEROUS = 1;
+  }
+  required Verdict verdict = 1;
+}