replace x/net/context by standard package

internal/token.go

@@ -5,6 +5,7 @@
 package internal
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -17,7 +18,6 @@ import (
 	"strings"
 	"time"
 
-	"golang.org/x/net/context"
 	"golang.org/x/net/context/ctxhttp"
 )
 

internal/token_test.go

@@ -5,14 +5,13 @@
 package internal
 
 import (
+	"context"
 	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
 	"testing"
-
-	"golang.org/x/net/context"
 )
 
 func TestRegisterBrokenAuthHeaderProvider(t *testing.T) {

internal/transport.go

@@ -5,9 +5,8 @@
 package internal
 
 import (
+	"context"
 	"net/http"
-
-	"golang.org/x/net/context"
 )
 
 // HTTPClient is the context key to use with golang.org/x/net/context's