vendor: update all dependencies to latest versions

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

@@ -15,17 +15,15 @@
 // Package transport/http supports network connections to HTTP servers.
 // This package is not intended for use by end developers. Use the
 // google.golang.org/api/option package to configure API clients.
-package transport
+package http
 
 import (
 	"errors"
-	"fmt"
 	"net/http"
 
 	"golang.org/x/net/context"
 	"golang.org/x/oauth2"
-	"golang.org/x/oauth2/google"
-	gtransport "google.golang.org/api/googleapi/transport"
+	"google.golang.org/api/googleapi/transport"
 	"google.golang.org/api/internal"
 	"google.golang.org/api/option"
 )
@@ -47,7 +45,7 @@ func NewClient(ctx context.Context, opts ...option.ClientOption) (*http.Client,
 	}
 	if o.APIKey != "" {
 		hc := &http.Client{
-			Transport: &gtransport.APIKey{
+			Transport: &transport.APIKey{
 				Key: o.APIKey,
 				Transport: userAgentTransport{
 					base:      baseTransport(ctx),
@@ -57,23 +55,13 @@ func NewClient(ctx context.Context, opts ...option.ClientOption) (*http.Client,
 		}
 		return hc, o.Endpoint, nil
 	}
-	if o.ServiceAccountJSONFilename != "" {
-		ts, err := internal.ServiceAcctTokenSource(ctx, o.ServiceAccountJSONFilename, o.Scopes...)
-		if err != nil {
-			return nil, "", err
-		}
-		o.TokenSource = ts
-	}
-	if o.TokenSource == nil {
-		var err error
-		o.TokenSource, err = google.DefaultTokenSource(ctx, o.Scopes...)
-		if err != nil {
-			return nil, "", fmt.Errorf("google.DefaultTokenSource: %v", err)
-		}
+	creds, err := internal.Creds(ctx, &o)
+	if err != nil {
+		return nil, "", err
 	}
 	hc := &http.Client{
 		Transport: &oauth2.Transport{
-			Source: o.TokenSource,
+			Source: creds.TokenSource,
 			Base: userAgentTransport{
 				base:      baseTransport(ctx),
 				userAgent: o.UserAgent,

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

@@ -14,7 +14,7 @@
 
 // +build appengine
 
-package transport
+package http
 
 import (
 	"net/http"