Removed useless notifications and fileSystem manifest permissions 
Removed useless notifications and fileSystem manifest permissions 

"notifications" and "fileSystem" permissions seem to not be used by the app.
adrifelt/apps-developer-tools,GoogleChrome/apps-developer-tools,modulexcite/apps-developer-tools,adrifelt/apps-developer-tools,GoogleChrome/apps-developer-tools,modulexcite/apps-developer-tools,modulexcite/apps-developer-tools