Remove ActionDispatch::Head middleware in favor of Rack::Head

Closes #7110 there's more work to do on rack-cache issue 69

actionpack/lib/action_dispatch/http/request.rb

@@ -119,9 +119,9 @@ def delete?
     end
 
     # Is this a HEAD request?
-    # Equivalent to <tt>request.method_symbol == :head</tt>.
+    # Equivalent to <tt>request.request_method_symbol == :head</tt>.
     def head?
-      HTTP_METHOD_LOOKUP[method] == :head
+      HTTP_METHOD_LOOKUP[request_method] == :head
     end
 
     # Provides access to the request's HTTP headers, for example:

actionpack/test/abstract_unit.rb

@@ -171,7 +171,7 @@ def self.build_app(routes = nil)
       middleware.use "ActionDispatch::ParamsParser"
       middleware.use "ActionDispatch::Cookies"
       middleware.use "ActionDispatch::Flash"
-      middleware.use "ActionDispatch::Head"
+      middleware.use "Rack::Head"
       yield(middleware) if block_given?
     end
   end

actionpack/test/dispatch/request_test.rb

@@ -461,14 +461,6 @@ def url_for(options = {})
     end
   end
 
-  test "head masquerading as get" do
-    request = stub_request 'REQUEST_METHOD' => 'GET', "rack.methodoverride.original_method" => "HEAD"
-    assert_equal "HEAD", request.method
-    assert_equal "GET",  request.request_method
-    assert request.get?
-    assert request.head?
-  end
-
   test "post masquerading as patch" do
     request = stub_request 'REQUEST_METHOD' => 'PATCH', "rack.methodoverride.original_method" => "POST"
     assert_equal "POST", request.method

railties/lib/rails/application.rb

@@ -310,7 +310,7 @@ def default_middleware_stack #:nodoc:
         end
 
         middleware.use ::ActionDispatch::ParamsParser
-        middleware.use ::ActionDispatch::Head
+        middleware.use ::Rack::Head
         middleware.use ::Rack::ConditionalGet
         middleware.use ::Rack::ETag, "no-cache"
 

railties/test/application/middleware_test.rb

@@ -45,7 +45,7 @@ def app
         "ActionDispatch::Session::CookieStore",
         "ActionDispatch::Flash",
         "ActionDispatch::ParamsParser",
-        "ActionDispatch::Head",
+        "Rack::Head",
         "Rack::ConditionalGet",
         "Rack::ETag",
         "ActionDispatch::BestStandardsSupport"

railties/test/application/rack/logger_test.rb

@@ -26,12 +26,18 @@ def logs
         @logs ||= @logger.logged(:info)
       end
 
-      test "logger logs proper HTTP verb and path" do
+      test "logger logs proper HTTP GET verb and path" do
         get "/blah"
         wait
         assert_match(/^Started GET "\/blah"/, logs[0])
       end
 
+      test "logger logs proper HTTP HEAD verb and path" do
+        head "/blah"
+        wait
+        assert_match(/^Started HEAD "\/blah"/, logs[0])
+      end
+
       test "logger logs HTTP verb override" do
         post "/", {:_method => 'put'}
         wait