remove socket error handling, use server "clientError"

lib/application.js

@@ -129,12 +129,6 @@ app.callback = function(){
   return function(req, res){
     var ctx = new self.Context(self, req, res);
 
-    if (1 == ctx.socket.listeners('error').length) {
-      ctx.socket.on('error', function(err){
-        self.emit('error', err);
-      });
-    }
-
     co.call(ctx, function *(){
       yield fn;
     }, function(err){

test/application.js

@@ -204,27 +204,6 @@ describe('app.respond', function(){
     })
   })
 
-  describe('when a socket error occurs', function(){
-    it('should emit "error" on the app', function(done){
-      var app = koa();
-
-      app.use(function(next){
-        return function *(){
-          this.socket.emit('error', new Error('tobi escaped'));
-        }
-      });
-
-      app.on('error', function(err){
-        err.message.should.equal('tobi escaped');
-        done();
-      });
-
-      request(app.listen())
-      .get('/')
-      .end(function(){});
-    })
-  })
-
   describe('when an error occurs', function(){
     it('should emit "error" on the app', function(done){
       var app = koa();