Macaron: remove custom Request type (#37874)

* remove macaron.Request, use http.Request instead

* remove com dependency from bindings module

* fix another c.Req.Request

pkg/api/dashboard_test.go

@@ -33,7 +33,7 @@ import (
 func TestGetHomeDashboard(t *testing.T) {
 	httpReq, err := http.NewRequest(http.MethodGet, "", nil)
 	require.NoError(t, err)
-	req := &models.ReqContext{SignedInUser: &models.SignedInUser{}, Context: &macaron.Context{Req: macaron.Request{Request: httpReq}}}
+	req := &models.ReqContext{SignedInUser: &models.SignedInUser{}, Context: &macaron.Context{Req: httpReq}}
 	cfg := setting.NewCfg()
 	cfg.StaticRootPath = "../../public/"