Use worker proto from @bazel_tools (#1330)

This avoids needing to vendor our own copy.

Author: illicitonion

src/java/io/bazel/rulesscala/coverage/instrumenter/BUILD

@@ -15,7 +15,7 @@ java_binary(
         "//src/java/io/bazel/rulesscala/io_utils",
         "//src/java/io/bazel/rulesscala/jar",
         "//src/java/io/bazel/rulesscala/worker",
-        "//third_party/bazel/src/main/protobuf:worker_protocol_java_proto",
+        "@bazel_tools//src/main/protobuf:worker_protocol_java_proto",
         "@bazel_tools//tools/jdk:JacocoCoverage",
     ],
 )

src/java/io/bazel/rulesscala/scalac/BUILD

@@ -8,7 +8,7 @@ load(
 SCALAC_DEPS = [
     "//scala/private/toolchain_deps:scala_compile_classpath",
     "//src/java/io/bazel/rulesscala/io_utils",
-    "//third_party/bazel/src/main/protobuf:worker_protocol_java_proto",
+    "@bazel_tools//src/main/protobuf:worker_protocol_java_proto",
     "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/jar",
     "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/worker",
     "@io_bazel_rules_scala//src/protobuf/io/bazel/rules_scala:diagnostics_java_proto",

src/java/io/bazel/rulesscala/worker/BUILD

@@ -5,7 +5,7 @@ java_library(
     srcs = ["Worker.java"],
     visibility = ["//visibility:public"],
     deps = [
-        "//third_party/bazel/src/main/protobuf:worker_protocol_java_proto",
+        "@bazel_tools//src/main/protobuf:worker_protocol_java_proto",
     ],
 )
 
@@ -20,6 +20,6 @@ java_test(
     test_class = "io.bazel.rulesscala.worker.WorkerTest",
     deps = [
         ":worker",
-        "//third_party/bazel/src/main/protobuf:worker_protocol_java_proto",
+        "@bazel_tools//src/main/protobuf:worker_protocol_java_proto",
     ],
 )

test/BUILD

@@ -540,8 +540,8 @@ scala_specs2_junit_test(
     name = "data_location_expansion",
     size = "small",
     srcs = ["src/main/scala/scalarules/test/location_expansion/LocationExpansionTest.scala"],
-    data = ["//third_party/bazel/src/main/protobuf:worker_protocol_java_proto"],
-    jvm_flags = ["-Dlocation.expanded='$(locations //third_party/bazel/src/main/protobuf:worker_protocol_java_proto)'"],
+    data = ["@bazel_tools//src/main/protobuf:worker_protocol_java_proto"],
+    jvm_flags = ["-Dlocation.expanded='$(locations @bazel_tools//src/main/protobuf:worker_protocol_java_proto)'"],
     suffixes = ["Test"],
 )