Rename the drive: scheme with the externalfile: scheme.

chrome/common/url_constants.h

 // 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.
 
 // Contains constants for known URLs and portions thereof.
 
 #ifndef CHROME_COMMON_URL_CONSTANTS_H_
 #define CHROME_COMMON_URL_CONSTANTS_H_
 
 #include <string>
@@ skipping 502 matching lines @@
 extern const char kChromeSearchLocalNtpHost[];
 extern const char kChromeSearchLocalNtpUrl[];
 extern const char kChromeSearchRemoteNtpHost[];
 
 // Host and URL for most visited iframes used on the Instant Extended NTP.
 extern const char kChromeSearchMostVisitedHost[];
 extern const char kChromeSearchMostVisitedUrl[];
 
 #if defined(OS_CHROMEOS)
 extern const char kCrosScheme[];
-extern const char kDriveScheme[];
+extern const char kExternalFileScheme[];
 #endif
 
 // "Learn more" URL for the Cloud Print section under Options.
 extern const char kCloudPrintLearnMoreURL[];
 
 // "Learn more" URL for the Cloud Print Preview No Destinations Promotion.
 extern const char kCloudPrintNoDestinationsLearnMoreURL[];
 
 // Parameters that get appended to force SafeSearch.
 extern const char kSafeSearchSafeParameter[];
 extern const char kSafeSearchSsuiParameter[];
 
 // The URL for the "Learn more" link in the media access infobar.
 extern const char kMediaAccessLearnMoreUrl[];
 
 // The URL for the "Learn more" link in the language settings.
 extern const char kLanguageSettingsLearnMoreUrl[];
 
 #if defined(OS_MACOSX)
 // The URL for the 32-bit Mac deprecation help center article
 extern const char kMac32BitDeprecationURL[];
 #endif
 
 // The URL for the "Learn more" link the the Easy Unlock settings.
 extern const char kEasyUnlockLearnMoreUrl[];
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_URL_CONSTANTS_H_