Don't log Action Cable to STDOUT in development

Logging Action Cable to STDOUT caused the development log to see double
messages like this:

```
Started GET "/" for ::1 at 2015-12-17 15:21:34 -0500
Started GET "/" for ::1 at 2015-12-17 15:21:34 -0500
Processing by Rails::WelcomeController#index as HTML
Processing by Rails::WelcomeController#index as HTML
Rendered /welcome/index.html.erb (0.0ms)
Rendered /welcome/index.html.erb (0.0ms)
Completed 200 OK in 3ms (Views: 1.3ms | ActiveRecord: 0.0ms)
Completed 200 OK in 3ms (Views: 1.3ms | ActiveRecord: 0.0ms)
```

Now that Action Cable is part of Rails it doesn't need it's own logger
and will log to STDOUT via the local dev server here:
https://github.com/rails/rails/blob/master/railties/lib/rails/commands/server.rb

2 files changed, 0 insertions, 10 deletions

diff --git a/actioncable/lib/action_cable/process/logging.rb b/actioncable/lib/action_cable/process/logging.rb
index 618ba7357a..72b1a080d1 100644
--- a/actioncable/lib/action_cable/process/logging.rb
+++ b/actioncable/lib/action_cable/process/logging.rb
@@ -8,5 +8,3 @@ EM.error_handler do |e|
 end
 
 Celluloid.logger = ActionCable.server.logger
-
-ActionCable.server.config.log_to_stdout if Rails.env.development?
\ No newline at end of file
diff --git a/actioncable/lib/action_cable/server/configuration.rb b/actioncable/lib/action_cable/server/configuration.rb
index 5d65f5e0e9..935133cbba 100644
--- a/actioncable/lib/action_cable/server/configuration.rb
+++ b/actioncable/lib/action_cable/server/configuration.rb
@@ -20,14 +20,6 @@ module ActionCable
         @disable_request_forgery_protection = false
       end
 
-      def log_to_stdout
-        console = ActiveSupport::Logger.new($stdout)
-        console.formatter = @logger.formatter
-        console.level = @logger.level
-
-        @logger.extend(ActiveSupport::Logger.broadcast(console))
-      end
-
       def channel_paths
         @channels ||= Dir["#{channels_path}/**/*_channel.rb"]
       end