Use the suggested name from an anchor's 'download' attribute.

chrome/browser/download/download_util.cc

Index: chrome/browser/download/download_util.cc
diff --git a/chrome/browser/download/download_util.cc b/chrome/browser/download/download_util.cc
index 2abf2d16127f81c5bc775c87dfefa2f5cf038d4a..e1db3ffd38fe7e253f00c1b64ea722df4033df25 100644
--- a/chrome/browser/download/download_util.cc
+++ b/chrome/browser/download/download_util.cc
@@ -288,16 +288,13 @@ void GenerateExtension(const FilePath& file_name,
   generated_extension->swap(extension);
 }
 
-void GenerateFileNameFromRequest(const GURL& url,
-                                 const std::string& content_disposition,
-                                 const std::string& referrer_charset,
-                                 const std::string& mime_type,
+void GenerateFileNameFromRequest(const DownloadItem& download_item,
                                  FilePath* generated_name) {
-  GenerateFileNameInternal(url,
-                           content_disposition,
-                           referrer_charset,
-                           std::string(),
-                           mime_type,
+  GenerateFileNameInternal(download_item.GetURL(),
+                           download_item.content_disposition(),
+                           download_item.referrer_charset(),
+                           download_item.suggested_filename(),
+                           download_item.mime_type(),
                            generated_name);
 }