Make isolated file system works for a device root (e.g. X:\\)

chrome/browser/extensions/api/app/app_api.cc

Index: chrome/browser/extensions/api/app/app_api.cc
diff --git a/chrome/browser/extensions/api/app/app_api.cc b/chrome/browser/extensions/api/app/app_api.cc
index 408ecd0b4e5a2d4a7d0120c94327df531a0fe311..259ac2be502974b177e6b8fc80688367764b305a 100644
--- a/chrome/browser/extensions/api/app/app_api.cc
+++ b/chrome/browser/extensions/api/app/app_api.cc
@@ -130,7 +130,7 @@ void AppEventRouter::DispatchOnLaunchedEvent(
 // static.
 void AppEventRouter::DispatchOnLaunchedEventWithFileEntry(
     Profile* profile, const Extension* extension, const string16& action,
-    const std::string& file_system_id, const FilePath& base_name) {
+    const std::string& file_system_id, const std::string& base_name) {
   // TODO(benwells): remove this logging.
   LOG(ERROR) << "Dispatching onLaunched with file entry.";
   ListValue args;
@@ -143,7 +143,7 @@ void AppEventRouter::DispatchOnLaunchedEventWithFileEntry(
   DictionaryValue* intent_data = new DictionaryValue();
   intent_data->SetString("format", "fileEntry");
   intent_data->SetString("fileSystemId", file_system_id);
-  intent_data->SetString("baseName", base_name.value());
+  intent_data->SetString("baseName", base_name);
   args.Append(intent_data);
   std::string json_args;
   base::JSONWriter::Write(&args, &json_args);