drive: Use "/drive/root" namespace and fix Files app and tests.

chrome/browser/ui/webui/chromeos/drive_internals_ui.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/ui/webui/chromeos/drive_internals_ui.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/format_macros.h"
@@ skipping 557 matching lines @@
 void DriveInternalsWebUIHandler::UpdateFileSystemContentsSection(
     google_apis::DriveServiceInterface* drive_service) {
   DCHECK(drive_service);
 
   // Start updating the file system tree section, if we have access token.
   drive::DriveSystemService* system_service = GetSystemService();
   if (!system_service->drive_service()->HasAccessToken())
     return;
 
   // Start rendering the file system tree as text.
-  const base::FilePath root_path = drive::util::GetDriveMyDriveRootPath();
+  const base::FilePath root_path = drive::util::GetDriveGrandRootPath();
 
   system_service->file_system()->GetEntryInfoByPath(
       root_path,
       base::Bind(&DriveInternalsWebUIHandler::OnGetEntryInfoByPath,
                  weak_ptr_factory_.GetWeakPtr(),
                  root_path));
 
   system_service->file_system()->ReadDirectoryByPath(
       root_path,
       base::Bind(&DriveInternalsWebUIHandler::OnReadDirectoryByPath,
@@ skipping 151 matching lines @@
       content::WebUIDataSource::Create(chrome::kChromeUIDriveInternalsHost);
   source->AddResourcePath("drive_internals.css", IDR_DRIVE_INTERNALS_CSS);
   source->AddResourcePath("drive_internals.js", IDR_DRIVE_INTERNALS_JS);
   source->SetDefaultResource(IDR_DRIVE_INTERNALS_HTML);
 
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile, source);
 }
 
 }  // namespace chromeos