Revert "Add Project::onDidChangePath()"

This reverts commit ed4acb02d8.

Conflicts:
	src/project.coffee

src/project.coffee

@@ -6,9 +6,7 @@ fs = require 'fs-plus'
 Q = require 'q'
 {deprecate} = require 'grim'
 {Model} = require 'theorist'
-{Subscriber} = require 'emissary'
-EmitterMixin = require('emissary').Emitter
-{Emitter} = require 'event-kit'
+{Emitter, Subscriber} = require 'emissary'
 Serializable = require 'serializable'
 TextBuffer = require 'text-buffer'
 {Directory} = require 'pathwatcher'
@@ -35,7 +33,6 @@ class Project extends Model
 
   constructor: ({path, @buffers}={}) ->
     @buffers ?= []
-    @emitter = new Emitter
 
     for buffer in @buffers
       do (buffer) =>
@@ -43,29 +40,6 @@ class Project extends Model
 
     @setPath(path)
 
-  ###
-  Section: Event Subscription
-  ###
-
-  # Essential: Invoke the given callback when the project's path has changed.
-  #
-  # * `callback` {Function}
-  #   * `path` the new path
-  onDidChangePath: (callback) ->
-    @emitter.on 'did-change-path', callback
-
-  on: (eventName) ->
-    switch eventName
-      when 'path-changed'
-        deprecate 'Use Project::onDidChangePath instead'
-      else
-        deprecate 'Project::on is deprecated. Use event subscription methods instead.'
-    EmitterMixin::on.apply(this, arguments)
-
-  ###
-  Section: Methods
-  ###
-
   serializeParams: ->
     path: @path
     buffers: _.compact(@buffers.map (buffer) -> buffer.serialize() if buffer.isRetained())
@@ -111,8 +85,7 @@ class Project extends Model
     else
       @rootDirectory = null
 
-    @emit 'path-changed'
-    @emitter.emit 'did-change-path', @getPath()
+    @emit "path-changed"
 
   # Public: Returns the root {Directory} object for this project.
   getRootDirectory: ->