Add download server IP address to the SafeBrowsing download protection ping.

content/browser/download/download_item_impl.h

Index: content/browser/download/download_item_impl.h
diff --git a/content/browser/download/download_item_impl.h b/content/browser/download/download_item_impl.h
index 04326fccffc96dc17b320b2b9004ea0295abf123..df5f9ff6aeedceb082196dc575aabc28e0b87c4d 100644
--- a/content/browser/download/download_item_impl.h
+++ b/content/browser/download/download_item_impl.h
@@ -102,6 +102,7 @@ class CONTENT_EXPORT DownloadItemImpl : public DownloadItem {
   virtual std::string GetMimeType() const OVERRIDE;
   virtual std::string GetOriginalMimeType() const OVERRIDE;
   virtual std::string GetReferrerCharset() const OVERRIDE;
+  virtual std::string GetRemoteAddress() const OVERRIDE;
   virtual int64 GetTotalBytes() const OVERRIDE;
   virtual void SetTotalBytes(int64 total_bytes) OVERRIDE;
   virtual const std::string& GetHash() const OVERRIDE;
@@ -210,6 +211,10 @@ class CONTENT_EXPORT DownloadItemImpl : public DownloadItem {
   // It's used to construct a suggested filename.
   std::string referrer_charset_;
 
+  // The remote IP address where the download was fetched from.  Copied from
+  // DownloadCreateInfo::remote_address.
+  std::string remote_address_;
+
   // Total bytes expected
   int64 total_bytes_;