[net] Cleanup filename_util and make it portable.

ui/base/dragdrop/os_exchange_data_provider_win.cc

Index: ui/base/dragdrop/os_exchange_data_provider_win.cc
diff --git a/ui/base/dragdrop/os_exchange_data_provider_win.cc b/ui/base/dragdrop/os_exchange_data_provider_win.cc
index 3b614bc15618736b9376ba580eb160c20941be19..ba0b893fc4f94fbd655681ba797c826c72fe3f39 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_win.cc
+++ b/ui/base/dragdrop/os_exchange_data_provider_win.cc
@@ -416,10 +416,13 @@ bool OSExchangeDataProviderWin::GetURLAndTitle(
     DCHECK(url->is_valid());
     return true;
   } else if (GetPlainTextURL(source_object_.get(), url)) {
-    if (url->is_valid())
-      *title = net::GetSuggestedFilename(*url, "", "", "", "", std::string());
-    else
+    if (url->is_valid()) {
+      *title = net::GenerateFileName(*url, std::string(), std::string(),
+                                     std::string(), std::string(),
+                                     std::string()).AsUTF16Unsafe();
+    } else {
       title->clear();
+    }
     return true;
   }
   return false;
@@ -907,8 +910,9 @@ static void CreateValidFileNameFromTitle(const GURL& url,
                                          base::string16* validated) {
   if (title.empty()) {
     if (url.is_valid()) {
-      *validated = net::GetSuggestedFilename(url, "", "", "", "",
-                                             std::string());
+      *validated = net::GenerateFileName(url, std::string(), std::string(),
+                                         std::string(), std::string(),
+                                         std::string()).AsUTF16Unsafe();
     } else {
       // Nothing else can be done, just use a default.
       *validated =