ci: use grpc_extra_deps() for gRPC dependencies (#152)

This (new with gRPC-1.26.0) function loads the dependencies of gRPC.
This is easier to use than listing each dependency ourselves.

Author: coryan

INSTALL.md

@@ -79,12 +79,8 @@ google_cloud_cpp_deps()
 #   https://github.com/bazelbuild/bazel/issues/1550
 load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")
 grpc_deps()
-load("@upb//bazel:workspace_deps.bzl", "upb_deps")
-upb_deps()
-load("@build_bazel_rules_apple//apple:repositories.bzl", "apple_rules_dependencies")
-apple_rules_dependencies()
-load("@build_bazel_apple_support//lib:repositories.bzl", "apple_support_dependencies")
-apple_support_dependencies()
+load("@com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")
+grpc_extra_deps()
 ```
 
 Then you can link the libraries from your `BUILD` files:

ci/test-install/WORKSPACE

@@ -51,9 +51,7 @@ switched_rules_by_language(
 load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")
 
 grpc_deps()
-load("@upb//bazel:workspace_deps.bzl", "upb_deps")
-upb_deps()
-load("@build_bazel_rules_apple//apple:repositories.bzl", "apple_rules_dependencies")
-apple_rules_dependencies()
-load("@build_bazel_apple_support//lib:repositories.bzl", "apple_support_dependencies")
-apple_support_dependencies()
+
+load("@com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")
+
+grpc_extra_deps()

ci/test-readme/generate-install.sh

@@ -100,12 +100,8 @@ google_cloud_cpp_deps()
 #   https://github.com/bazelbuild/bazel/issues/1550
 load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")
 grpc_deps()
-load("@upb//bazel:workspace_deps.bzl", "upb_deps")
-upb_deps()
-load("@build_bazel_rules_apple//apple:repositories.bzl", "apple_rules_dependencies")
-apple_rules_dependencies()
-load("@build_bazel_apple_support//lib:repositories.bzl", "apple_support_dependencies")
-apple_support_dependencies()
+load("@com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")
+grpc_extra_deps()
 ```
 
 Then you can link the libraries from your `BUILD` files: