Files.app: Enable externalfile: protocol for MTP volumes.

chrome/browser/chromeos/file_manager/filesystem_api_util.cc

 // Copyright 2014 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/file_manager/filesystem_api_util.h"
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 159 matching lines @@
 
     parser.file_system()->GetMetadata(
         parser.file_path(),
         chromeos::file_system_provider::ProvidedFileSystemInterface::
             METADATA_FIELD_DEFAULT,
         base::Bind(&GetMimeTypeAfterGetMetadataForProvidedFileSystem,
                    callback));
     return;
   }
 
-  // As a fallback just return success with an empty mime type value.
+  // As a fallback just return failure with an empty mime type value.
   content::BrowserThread::PostTask(
       content::BrowserThread::UI,
       FROM_HERE,
-      base::Bind(callback, true /* success */, std::string()));
+      base::Bind(callback, false /* failure */, std::string()));
 }
 
 void IsNonNativeLocalPathDirectory(
     Profile* profile,
     const base::FilePath& path,
     const base::Callback<void(bool)>& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(IsUnderNonNativeLocalPath(profile, path));
 
   GURL url;
@@ skipping 43 matching lines @@
       content::BrowserThread::IO,
       FROM_HERE,
       base::Bind(&PrepareFileOnIOThread,
                  make_scoped_refptr(context),
                  context->CrackURL(url),
                  google_apis::CreateRelayCallback(callback)));
 }
 
 }  // namespace util
 }  // namespace file_manager