Add error description to the DidFailProvisionalLoad callback.

chrome/renderer/localized_error.h

Index: chrome/renderer/localized_error.h
diff --git a/chrome/renderer/localized_error.h b/chrome/renderer/localized_error.h
index f327161e74082d1f70cdc2a6e92d597a1ffb0513..edfb49ce4dc230fa55ed231ee93ab7479b387310 100644
--- a/chrome/renderer/localized_error.h
+++ b/chrome/renderer/localized_error.h
@@ -9,6 +9,7 @@
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/string16.h"
 
 class Extension;
 class GURL;
@@ -28,6 +29,9 @@ class LocalizedError {
   static void GetStrings(const WebKit::WebURLError& error,
                          base::DictionaryValue* strings);
 
+  // Returns a description of the encountered error.
+  static string16 GetErrorDetails(const WebKit::WebURLError& error);
+
   // Returns true if an error page exists for the specified parameters.
   static bool HasStrings(const std::string& error_domain, int error_code);