Move Node#== to base class

lib/capybara/driver/node.rb

@@ -132,7 +132,7 @@ module Capybara
       end
 
       def ==(other)
-        raise NotSupportedByDriverError, 'Capybara::Driver::Node#=='
+        eql?(other) || (other.respond_to?(:native) && native == other.native)
       end
     end
   end

lib/capybara/node/simple.rb

@@ -192,7 +192,7 @@ module Capybara
       end
 
       def ==(other)
-        native == other.native
+        eql?(other) || (other.respond_to?(:native) && native == other.native)
       end
 
     private

lib/capybara/rack_test/node.rb

@@ -146,10 +146,6 @@ class Capybara::RackTest::Node < Capybara::Driver::Node
     end
   end
 
-  def ==(other)
-    native == other.native
-  end
-
 protected
 
   # @api private

lib/capybara/selenium/node.rb

@@ -199,10 +199,6 @@ class Capybara::Selenium::Node < Capybara::Driver::Node
     native.attribute('isContentEditable') == 'true'
   end
 
-  def ==(other)
-    native == other.native
-  end
-
   def path
     driver.evaluate_script GET_XPATH_SCRIPT, self
   end