Switch to using the dep tool and update all the dependencies

vendor/cloud.google.com/go/debugger/apiv2/doc.go

@@ -0,0 +1,36 @@
+// Copyright 2017, 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.
+
+// AUTO-GENERATED CODE. DO NOT EDIT.
+
+// Package debugger is an experimental, auto-generated package for the
+// debugger API.
+//
+// Examines the call stack and variables of a running application
+// without stopping or slowing it down.
+//
+// Use the client at cloud.google.com/go/cmd/go-cloud-debug-agent in preference to this.
+package debugger // import "cloud.google.com/go/debugger/apiv2"
+
+import (
+	"golang.org/x/net/context"
+	"google.golang.org/grpc/metadata"
+)
+
+func insertXGoog(ctx context.Context, val string) context.Context {
+	md, _ := metadata.FromContext(ctx)
+	md = md.Copy()
+	md["x-goog-api-client"] = []string{val}
+	return metadata.NewContext(ctx, md)
+}