Update dependencies

vendor/google.golang.org/api/gensupport/resumable.go

@@ -5,14 +5,13 @@
 package gensupport
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"io"
 	"net/http"
 	"sync"
 	"time"
-
-	"golang.org/x/net/context"
 )
 
 const (

vendor/google.golang.org/api/gensupport/retry.go

@@ -15,12 +15,11 @@
 package gensupport
 
 import (
+	"context"
 	"io"
 	"net"
 	"net/http"
 	"time"
-
-	"golang.org/x/net/context"
 )
 
 // Retry invokes the given function, retrying it multiple times if the connection failed or

vendor/google.golang.org/api/gensupport/send.go

@@ -5,12 +5,10 @@
 package gensupport
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"net/http"
-
-	"golang.org/x/net/context"
-	"golang.org/x/net/context/ctxhttp"
 )
 
 // Hook is the type of a function that is called once before each HTTP request
@@ -32,7 +30,8 @@ func RegisterHook(h Hook) {
 
 // SendRequest sends a single HTTP request using the given client.
 // If ctx is non-nil, it calls all hooks, then sends the request with
-// ctxhttp.Do, then calls any functions returned by the hooks in reverse order.
+// req.WithContext, then calls any functions returned by the hooks in
+// reverse order.
 func SendRequest(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
 	// Disallow Accept-Encoding because it interferes with the automatic gzip handling
 	// done by the default http.Transport. See https://github.com/google/google-api-go-client/issues/219.
@@ -50,7 +49,7 @@ func SendRequest(ctx context.Context, client *http.Client, req *http.Request) (*
 	}
 
 	// Send request.
-	resp, err := ctxhttp.Do(ctx, client, req)
+	resp, err := send(ctx, client, req)
 
 	// Call returned funcs in reverse order.
 	for i := len(post) - 1; i >= 0; i-- {
@@ -61,6 +60,23 @@ func SendRequest(ctx context.Context, client *http.Client, req *http.Request) (*
 	return resp, err
 }
 
+func send(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
+	if client == nil {
+		client = http.DefaultClient
+	}
+	resp, err := client.Do(req.WithContext(ctx))
+	// If we got an error, and the context has been canceled,
+	// the context's error is probably more useful.
+	if err != nil {
+		select {
+		case <-ctx.Done():
+			err = ctx.Err()
+		default:
+		}
+	}
+	return resp, err
+}
+
 // DecodeResponse decodes the body of res into target. If there is no body,
 // target is unchanged.
 func DecodeResponse(target interface{}, res *http.Response) error {