Rename the drive: scheme with the externalfile: scheme.

chrome/common/url_constants.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/common/url_constants.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "content/public/common/url_constants.h"
 #include "url/url_util.h"
 
 namespace chrome {
 
 #if defined(OS_CHROMEOS)
 const char kCrosScheme[] = "cros";
-const char kDriveScheme[] = "drive";
+const char kExternalFileScheme[] = "externalfile";
 #endif
 
 // Add Chrome UI URLs as necessary, in alphabetical order.
 // Be sure to add the corresponding kChromeUI*Host constant below.
 // This is a WebUI page that lists other WebUI pages.
 const char kChromeUIAboutURL[] = "chrome://about/";
 const char kChromeUIAppsURL[] = "chrome://apps/";
 const char kChromeUIAppListStartPageURL[] = "chrome://app-list/";
 const char kChromeUIBookmarksURL[] = "chrome://bookmarks/";
 const char kChromeUICertificateViewerURL[] = "chrome://view-cert/";
@@ skipping 692 matching lines @@
     "https://support.google.com/chrome/?p=ui_mac_32bit_support";
 #else
     "";
 #endif
 #endif
 
 const char kEasyUnlockLearnMoreUrl[] =
     "https://support.google.com/chromebook/answer/6070209";
 
 }  // namespace chrome