drive: Stop setting dummy resource ID for "drive" and "other"

chrome/browser/chromeos/drive/file_system.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/drive/file_system.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/platform_file.h"
 #include "base/prefs/pref_service.h"
@@ skipping 725 matching lines @@
     const GetShareUrlCallback& callback,
     FileError error,
     scoped_ptr<ResourceEntry> entry) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
   if (error != FILE_ERROR_OK) {
     callback.Run(error, GURL());
     return;
   }
-  if (util::IsSpecialResourceId(entry->resource_id())) {
-    // Do not load special directories. Just return.
+  if (entry->resource_id().empty()) {
+    // This entry does not exist on the server. Just return.
     callback.Run(FILE_ERROR_FAILED, GURL());
     return;
   }
 
   scheduler_->GetShareUrl(
       entry->resource_id(),
       embed_origin,
       ClientContext(USER_INITIATED),
       base::Bind(&FileSystem::OnGetResourceEntryForGetShareUrl,
                  weak_ptr_factory_.GetWeakPtr(),
@@ skipping 168 matching lines @@
                           OpenMode open_mode,
                           const std::string& mime_type,
                           const OpenFileCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
   open_file_operation_->OpenFile(file_path, open_mode, mime_type, callback);
 }
 
 }  // namespace drive