Remove unused imports to test recipes-with-led

Change-Id: I1aa93af85dc12fc6de8995359fa3a7145a98de8b
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/59720
Reviewed-by: Christopher Fujino <fujino@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>

recipes/engine_v2/builder.py

diff --git a/recipes/engine_v2/builder.py b/recipes/engine_v2/builder.py
index 551a2b9..d47b52d 100644
--- a/recipes/engine_v2/builder.py
+++ b/recipes/engine_v2/builder.py
@@ -29,9 +29,6 @@
 import copy
 import re
 
-from google.protobuf import struct_pb2
-from PB.go.chromium.org.luci.buildbucket.proto import build as build_pb2
-
 DEPS = [
     'depot_tools/depot_tools',
     'flutter/archives',

recipes/engine_v2/engine_v2.py

diff --git a/recipes/engine_v2/engine_v2.py b/recipes/engine_v2/engine_v2.py
index b509f81..c0d57a8 100644
--- a/recipes/engine_v2/engine_v2.py
+++ b/recipes/engine_v2/engine_v2.py
@@ -12,13 +12,6 @@
 # to be ready and then spawn subbuilds to run expensive tests using
 # engine_v2/tester.py.
 
-from contextlib import contextmanager
-from google.protobuf import struct_pb2
-
-from PB.go.chromium.org.luci.buildbucket.proto import build as build_pb2
-from PB.go.chromium.org.luci.buildbucket.proto \
-  import builds_service as builds_service_pb2
-
 from RECIPE_MODULES.flutter.flutter_bcid.api import BcidStage
 
 DEPS = [

recipes/engine_v2/tester_engine.py

diff --git a/recipes/engine_v2/tester_engine.py b/recipes/engine_v2/tester_engine.py
index c4dc57a..ed9ece0 100644
--- a/recipes/engine_v2/tester_engine.py
+++ b/recipes/engine_v2/tester_engine.py
@@ -46,12 +46,6 @@
 test configuration is defined in the engine build configurations files as global tests.
 """
 import contextlib
-import copy
-
-from contextlib import contextmanager
-
-from google.protobuf import struct_pb2
-from PB.go.chromium.org.luci.buildbucket.proto import build as build_pb2
 
 DEPS = [
     'depot_tools/depot_tools',