vendor: update all dependencies

vendor/google.golang.org/api/transport/http/dial.go

@@ -46,34 +46,31 @@ func NewClient(ctx context.Context, opts ...option.ClientOption) (*http.Client,
 	if o.HTTPClient != nil {
 		return o.HTTPClient, o.Endpoint, nil
 	}
-	uat := userAgentTransport{
-		base:      baseTransport(ctx),
+	trans := baseTransport(ctx)
+	trans = userAgentTransport{
+		base:      trans,
 		userAgent: o.UserAgent,
 	}
-	var hc *http.Client
+	trans = addOCTransport(trans)
 	switch {
 	case o.NoAuth:
-		hc = &http.Client{Transport: uat}
+		// Do nothing.
 	case o.APIKey != "":
-		hc = &http.Client{
-			Transport: &transport.APIKey{
-				Key:       o.APIKey,
-				Transport: uat,
-			},
+		trans = &transport.APIKey{
+			Transport: trans,
+			Key:       o.APIKey,
 		}
 	default:
 		creds, err := internal.Creds(ctx, &o)
 		if err != nil {
 			return nil, "", err
 		}
-		hc = &http.Client{
-			Transport: &oauth2.Transport{
-				Source: creds.TokenSource,
-				Base:   uat,
-			},
+		trans = &oauth2.Transport{
+			Base:   trans,
+			Source: creds.TokenSource,
 		}
 	}
-	return hc, o.Endpoint, nil
+	return &http.Client{Transport: trans}, o.Endpoint, nil
 }
 
 type userAgentTransport struct {

vendor/google.golang.org/api/transport/http/go18.go

@@ -0,0 +1,33 @@
+// Copyright 2018 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build go1.8
+
+package http
+
+import (
+	"net/http"
+
+	"go.opencensus.io/plugin/ochttp"
+	ocgoogle "go.opencensus.io/plugin/ochttp/propagation/google"
+)
+
+func addOCTransport(trans http.RoundTripper) http.RoundTripper {
+	return &ochttp.Transport{
+		Base: trans,
+		// TODO(ramonza): enable stats after census-instrumentation/opencensus-go#302
+		NoStats:     true,
+		Propagation: &ocgoogle.HTTPFormat{},
+	}
+}

vendor/google.golang.org/api/transport/http/not_go18.go

@@ -0,0 +1,21 @@
+// Copyright 2018 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !go1.8
+
+package http
+
+import "net/http"
+
+func addOCTransport(trans http.RoundTripper) http.RoundTripper { return trans }