Extract external file systems handling from isolated context.

chrome/browser/intents/device_attached_intent_source.cc

Index: chrome/browser/intents/device_attached_intent_source.cc
diff --git a/chrome/browser/intents/device_attached_intent_source.cc b/chrome/browser/intents/device_attached_intent_source.cc
index 0f0244acfda3afd7f12221032ddf3727728bff7f..df8966113fd951a454e47b8e446beaeec2163dbd 100644
--- a/chrome/browser/intents/device_attached_intent_source.cc
+++ b/chrome/browser/intents/device_attached_intent_source.cc
@@ -128,7 +128,6 @@ void DeviceAttachedIntentSource::DispatchIntentsForService(
 
   std::string device_name(UTF16ToUTF8(device_info.name));
   const FilePath device_path(device_info.location);
-

[kinuko, 2013/01/10 05:47:31]

nit: let's not make nop changes in the files you're not touching

[tonibarzic, 2013/01/11 01:50:04]

Done.

   // TODO(kinuko, kmadhusu): Use a different file system type for MTP.
   // TODO(kmadhusu): To manage the registered file systems efficiently, register
   // the attached device media file system using MediaFileSystemRegistry.