Extract external file systems handling from isolated context.

chrome/browser/extensions/platform_app_launcher.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/extensions/platform_app_launcher.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 222 matching lines @@
     // regranted, as this would overwrite any other permissions which the
     // renderer may already have.
     if (!policy->CanReadFile(renderer_id, file_path_))
       policy->GrantReadFile(renderer_id, file_path_);
 
     std::string registered_name;
     fileapi::IsolatedContext* isolated_context =
         fileapi::IsolatedContext::GetInstance();
     DCHECK(isolated_context);
     std::string filesystem_id = isolated_context->RegisterFileSystemForPath(
-        fileapi::kFileSystemTypeNativeLocal, file_path_, &registered_name);
+        fileapi::kFileSystemTypeNativeLocal, file_path_,
+        &registered_name);
     // Granting read file system permission as well to allow file-system
     // read operations.
     policy->GrantReadFileSystem(renderer_id, filesystem_id);
 
     extensions::AppEventRouter::DispatchOnLaunchedEventWithFileEntry(
         profile_, extension_, ASCIIToUTF16(web_intents::kActionView),
         handler_id_, mime_type, filesystem_id, registered_name);
   }
 
   // The profile the app should be run in.
@@ skipping 156 matching lines @@
     const Extension* extension,
     content::WebIntentsDispatcher* intents_dispatcher,
     content::WebContents* source) {
   scoped_refptr<PlatformAppWebIntentLauncher> launcher =
       new PlatformAppWebIntentLauncher(
           profile, extension, intents_dispatcher, source);
   launcher->Launch();
 }
 
 }  // namespace extensions