Issue #1810686 by Rob Loach: Remove the remaining files[] entries .

core/modules/field/tests/modules/field_test/field_test.info

@@ -2,6 +2,5 @@ name = "Field API Test"
 description = "Support module for the Field API tests."
 core = 8.x
 package = Testing
-files[] = field_test.entity.inc
 version = VERSION
 hidden = TRUE

core/modules/file/tests/file_test/file_test.info

@@ -3,5 +3,4 @@ description = "Support module for file handling tests."
 package = Testing
 version = VERSION
 core = 8.x
-files[] = file_test.module
 hidden = TRUE

core/modules/system/system.info

@@ -5,6 +5,3 @@ version = VERSION
 core = 8.x
 required = TRUE
 configure = admin/config/system
-
-; Tests in tests directory.
-files[] = tests/registry.test