all: change golang.org/x/net/context to context

Run commands:
- go tool fix -r context .
- goimports .

Change-Id: I231da3b8de36a0362f5988df7b00bb4bfec6d58a
Reviewed-on: https://go-review.googlesource.com/c/build/+/468015
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>

internal/task/version.go

@@ -1,6 +1,7 @@
 package task
 
 import (
+	"context"
 	"fmt"
 	"strconv"
 	"strings"
@@ -9,7 +10,6 @@ import (
 	"golang.org/x/build/buildlet"
 	"golang.org/x/build/gerrit"
 	"golang.org/x/build/internal/workflow"
-	"golang.org/x/net/context"
 )
 
 // VersionTasks contains tasks related to versioning the release.

perf/app/compare.go

@@ -5,6 +5,7 @@
 package app
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"net/http"
@@ -17,7 +18,6 @@ import (
 	"github.com/google/safehtml"
 	"github.com/google/safehtml/template"
 	"golang.org/x/build/perfdata/query"
-	"golang.org/x/net/context"
 	"golang.org/x/perf/benchstat"
 	"golang.org/x/perf/storage/benchfmt"
 )

perf/app/compare_test.go

@@ -5,6 +5,7 @@
 package app
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"net/http/httptest"
@@ -13,7 +14,6 @@ import (
 	"testing"
 
 	"golang.org/x/build/perfdata"
-	"golang.org/x/net/context"
 	"golang.org/x/perf/storage/benchfmt"
 )
 

perfdata/app/appengine.go

@@ -8,9 +8,9 @@
 package app
 
 import (
+	"context"
 	"net/http"
 
-	"golang.org/x/net/context"
 	"google.golang.org/appengine"
 	"google.golang.org/appengine/log"
 )

perfdata/app/local.go

@@ -8,10 +8,9 @@
 package app
 
 import (
+	"context"
 	"log"
 	"net/http"
-
-	"golang.org/x/net/context"
 )
 
 // requestContext returns the Context object for a given request.

perfdata/app/upload.go

@@ -5,6 +5,7 @@
 package app
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -18,7 +19,6 @@ import (
 	"time"
 
 	"golang.org/x/build/perfdata/db"
-	"golang.org/x/net/context"
 	"golang.org/x/perf/storage/benchfmt"
 )
 

perfdata/appengine/app.go

@@ -6,6 +6,7 @@
 package main
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"log"
@@ -18,7 +19,6 @@ import (
 	"golang.org/x/build/perfdata/app"
 	"golang.org/x/build/perfdata/db"
 	"golang.org/x/build/perfdata/fs/gcs"
-	"golang.org/x/net/context"
 	oauth2 "google.golang.org/api/oauth2/v2"
 	"google.golang.org/appengine"
 	aelog "google.golang.org/appengine/log"

perfdata/client.go

@@ -6,6 +6,7 @@
 package perfdata
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -14,7 +15,6 @@ import (
 	"net/http"
 	"net/url"
 
-	"golang.org/x/net/context"
 	"golang.org/x/net/context/ctxhttp"
 	"golang.org/x/perf/storage/benchfmt"
 )

perfdata/client_test.go

@@ -6,6 +6,7 @@ package perfdata
 
 import (
 	"bytes"
+	"context"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -15,7 +16,6 @@ import (
 	"testing"
 
 	"golang.org/x/build/internal/diff"
-	"golang.org/x/net/context"
 	"golang.org/x/perf/storage/benchfmt"
 )
 

perfdata/db/db.go

@@ -8,6 +8,7 @@ package db
 
 import (
 	"bytes"
+	"context"
 	"database/sql"
 	"fmt"
 	"io"
@@ -20,7 +21,6 @@ import (
 
 	"golang.org/x/build/perfdata"
 	"golang.org/x/build/perfdata/query"
-	"golang.org/x/net/context"
 	"golang.org/x/perf/storage/benchfmt"
 )
 

perfdata/db/db_test.go

@@ -9,6 +9,7 @@ package db_test
 
 import (
 	"bytes"
+	"context"
 	"fmt"
 	"reflect"
 	"sort"
@@ -20,7 +21,6 @@ import (
 	"golang.org/x/build/internal/diff"
 	. "golang.org/x/build/perfdata/db"
 	"golang.org/x/build/perfdata/db/dbtest"
-	"golang.org/x/net/context"
 	"golang.org/x/perf/storage/benchfmt"
 )
 

perfdata/fs/fs.go

@@ -7,12 +7,11 @@
 package fs
 
 import (
+	"context"
 	"errors"
 	"io"
 	"sort"
 	"sync"
-
-	"golang.org/x/net/context"
 )
 
 // An FS stores uploaded benchmark data files.

perfdata/fs/gcs/gcs.go

@@ -6,9 +6,10 @@
 package gcs
 
 import (
+	"context"
+
 	"cloud.google.com/go/storage"
 	"golang.org/x/build/perfdata/fs"
-	"golang.org/x/net/context"
 )
 
 // impl is an fs.FS backed by Google Cloud Storage.

perfdata/fs/local/local.go

@@ -8,11 +8,11 @@
 package local
 
 import (
+	"context"
 	"os"
 	"path/filepath"
 
 	"golang.org/x/build/perfdata/fs"
-	"golang.org/x/net/context"
 )
 
 // impl is an fs.FS backed by local disk.