Remove unused Context#defined_in? method

Author: st0012

lib/rdoc/code_object/context.rb

@@ -688,13 +688,6 @@ def current_section
     section
   end
 
-  ##
-  # Is part of this thing was defined in +file+?
-
-  def defined_in?(file)
-    @in_files.include?(file)
-  end
-
   def display(method_attr) # :nodoc:
     if method_attr.is_a? RDoc::Attr
       "#{method_attr.definition} #{method_attr.pretty_name}"

test/rdoc/test_rdoc_context.rb

@@ -437,12 +437,6 @@ def test_current_section
     assert_equal default_section, @context.current_section
   end
 
-  def test_defined_in_eh
-    assert @c1.defined_in?(@c1.top_level)
-
-    refute @c1.defined_in?(@store.add_file('name.rb'))
-  end
-
   def test_equals2
     assert_equal @c3,    @c3
     refute_equal @c2,    @c3