longrunning: migrate to microgen

* bump microgenerator version to v0.10.0

Evaluation diff: https://code-review.googlesource.com/c/gocloud/+/50610

Change-Id: Ibc36b588e60c342886d5779857cda2140e239c8e
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/50630
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Tyler Bui-Palsulich <tbp@google.com>
diff --git a/internal/gapicgen/generator/config.go b/internal/gapicgen/generator/config.go
index 4c2603f..1ce6b06 100644
--- a/internal/gapicgen/generator/config.go
+++ b/internal/gapicgen/generator/config.go
@@ -432,6 +432,14 @@
 		apiServiceConfigPath:  "google/iam/credentials/v1/iamcredentials_v1.yaml",
 		releaseLevel:          "alpha",
 	},
+	{
+		inputDirectoryPath:    "google/longrunning",
+		pkg:                   "longrunning",
+		importPath:            "cloud.google.com/go/longrunning/autogen",
+		gRPCServiceConfigPath: "google/longrunning/longrunning_grpc_service_config.json",
+		apiServiceConfigPath:  "google/longrunning/longrunning.yaml",
+		releaseLevel:          "alpha",
+	},
 }
 
 // Relative to gocloud dir.
@@ -458,7 +466,6 @@
 	"google/cloud/vision/artman_vision_v1p1beta1.yaml",
 	"google/devtools/containeranalysis/artman_containeranalysis_v1beta1.yaml",
 	"google/logging/artman_logging.yaml",
-	"google/longrunning/artman_longrunning.yaml",
 	"google/monitoring/artman_monitoring.yaml",
 	"google/pubsub/artman_pubsub.yaml",
 }
diff --git a/internal/gapicgen/go.mod b/internal/gapicgen/go.mod
index e246960..5f3aea6 100644
--- a/internal/gapicgen/go.mod
+++ b/internal/gapicgen/go.mod
@@ -4,10 +4,9 @@
 
 require (
 	github.com/andygrunwald/go-gerrit v0.0.0-20191101112536-3f5e365ccf57
-	github.com/google/go-cmp v0.4.0 // indirect
 	github.com/google/go-github v17.0.0+incompatible
 	github.com/google/go-querystring v1.0.0 // indirect
-	github.com/googleapis/gapic-generator-go v0.9.9
+	github.com/googleapis/gapic-generator-go v0.10.0
 	github.com/kr/pretty v0.2.0 // indirect
 	github.com/stretchr/testify v1.4.0 // indirect
 	golang.org/x/crypto v0.0.0-20200115085410-6d4e4cb37c7d // indirect
@@ -16,7 +15,6 @@
 	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
 	golang.org/x/sys v0.0.0-20200113162924-86b910548bc1 // indirect
 	google.golang.org/appengine v1.6.5 // indirect
-	google.golang.org/genproto v0.0.0-20200115191322-ca5a22157cba // indirect
 	google.golang.org/grpc v1.26.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/src-d/go-git.v4 v4.13.1
diff --git a/internal/gapicgen/go.sum b/internal/gapicgen/go.sum
index bcd5423..c317555 100644
--- a/internal/gapicgen/go.sum
+++ b/internal/gapicgen/go.sum
@@ -56,6 +56,7 @@
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/googleapis/gapic-generator-go v0.9.9 h1:VoqkO6pAORaM/0EJuGSu0yjkriKHK8YRCGA1IOLC/kQ=
 github.com/googleapis/gapic-generator-go v0.9.9/go.mod h1:xSV5wdZHDFuGBD2x2pg/l3EmZFWm5RQLjag1D2tHhZU=
+github.com/googleapis/gapic-generator-go v0.10.0/go.mod h1:Z5U2mmu++2TpmDNPEBXiwht2Og6Xdlup5T6mSZtXfuU=
 github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 h1:BQSFePA1RWJOlocH6Fxy8MmwDt+yVQYULKfN0RoTN8A=
 github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99/go.mod h1:1lJo3i6rXxKeerYnT8Nvf0QmHCRC1n8sfWVwXF2Frvo=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=