Remove unused ConnectionFailed exception

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8361 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/base.rb

@@ -17,8 +17,6 @@ class AdapterNotFound < ActiveRecordError # :nodoc:
   end
   class ConnectionNotEstablished < ActiveRecordError #:nodoc:
   end
-  class ConnectionFailed < ActiveRecordError #:nodoc:
-  end
   class RecordNotFound < ActiveRecordError #:nodoc:
   end
   class RecordNotSaved < ActiveRecordError #:nodoc: