Revert "Made Pry able to cd into procs"

This reverts commit 206c79588c.

lib/pry/core_extensions.rb

@@ -30,13 +30,13 @@ class Object
       begin
         instance_eval %{
           def __binding_impl__
-            Kernel.binding
+            binding
           end
         }
       rescue TypeError
         self.class.class_eval %{
           def __binding_impl__
-            Kernel.binding
+            binding
           end
         }
       end

test/test_pry.rb

@@ -297,11 +297,6 @@ describe Pry do
           Pry.binding_for(_main_.call).should == TOPLEVEL_BINDING
           Pry.binding_for(_main_.call).should == Pry.binding_for(_main_.call)
         end
-
-        it 'should return a binding with the right self for procs' do
-          proc = Proc.new {}
-          Pry.binding_for(proc).eval("self").should.equal? proc
-        end
       end