Undo add command line parameter to set portable

undo 4312f76ed7 to include this in a pull
request of its own

src/browser/atom-portable.coffee

@@ -8,9 +8,6 @@ class AtomPortable
     execDirectoryPath = path.dirname(process.execPath)
     path.join(execDirectoryPath, '..', '.atom')
 
-  @setPortable: (existingAtomHome) ->
-    fs.copySync(existingAtomHome, @getPortableAtomHomePath())
-
   @isPortableInstall: (platform, environmentAtomHome) ->
     return false unless platform is 'win32'
     return false if environmentAtomHome

src/browser/main.coffee

@@ -61,7 +61,6 @@ setupAtomHome = (args) ->
   return if process.env.ATOM_HOME
   atomHome = path.join(app.getHomeDir(), '.atom')
   AtomPortable = require './atom-portable'
-  AtomPortable.setPortable(atomHome) if not AtomPortable.isPortableInstall(process.platform, process.env.ATOM_HOME) and args.setPortable
   atomHome = AtomPortable.getPortableAtomHomePath() if AtomPortable.isPortableInstall(process.platform, process.env.ATOM_HOME)
   try
     atomHome = fs.realpathSync(atomHome)
@@ -108,7 +107,6 @@ parseCommandLine = ->
   options.alias('t', 'test').boolean('t').describe('t', 'Run the specified specs and exit with error code on failures.')
   options.alias('v', 'version').boolean('v').describe('v', 'Print the version.')
   options.alias('w', 'wait').boolean('w').describe('w', 'Wait for window to be closed before returning.')
-  options.alias('p', 'set-portable').boolean('p').describe('p', 'Set portable mode.')
   options.string('socket-path')
 
   args = options.argv
@@ -134,7 +132,6 @@ parseCommandLine = ->
   profileStartup = args['profile-startup']
   urlsToOpen = []
   devResourcePath = process.env.ATOM_DEV_RESOURCE_PATH ? path.join(app.getHomeDir(), 'github', 'atom')
-  setPortable = args['set-portable']
 
   if args['resource-path']
     devMode = true
@@ -164,6 +161,6 @@ parseCommandLine = ->
 
   {resourcePath, devResourcePath, pathsToOpen, urlsToOpen, executedFrom, test,
    version, pidToKillWhenClosed, devMode, safeMode, newWindow, specDirectory,
-   logFile, socketPath, profileStartup, setPortable}
+   logFile, socketPath, profileStartup}
 
 start()