Semiautomated rollback of changelist 176873598.

*** Reason for rollback ***

[Python 2 is dead, dead, dead]([]

*** Original change description ***

Add six to deps of has_services=1 py_proto_librarys.

RELNOTES:
Add six to deps of has_services=1 py_proto_librarys.
PiperOrigin-RevId: 449147774
diff --git a/src/test/java/com/google/devtools/build/lib/packages/util/MockProtoSupport.java b/src/test/java/com/google/devtools/build/lib/packages/util/MockProtoSupport.java
index 1f0535f..16b86f0 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/util/MockProtoSupport.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/util/MockProtoSupport.java
@@ -186,11 +186,6 @@
         "package(default_visibility=['//visibility:public'])",
         "go_library(name = 'context',",
         "           srcs = [ 'context.go' ])");
-    config.create("third_party/py/six/BUILD",
-        "package(default_visibility=['//visibility:public'])",
-        "licenses(['notice'])",
-        "py_library(name = 'six',",
-        "           srcs = [ '__init__.py' ])");
     // TODO(b/77901188): remove once j_p_l migration is complete
     config.create(
         "third_party/java/jsr250_annotations/BUILD",