Update APIs to use new Google cloud paths.

grpc/discovery/discovery.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 // Package discovery implements RPC service introspection.
 package discovery
 
 import (
         "crypto/sha1"
         "fmt"
 
         "github.com/golang/protobuf/proto"
         "golang.org/x/net/context"
 
-        "github.com/luci/luci-go/common/proto/google/descriptor"
         "github.com/luci/luci-go/grpc/prpc"
+        "google.golang.org/genproto/protobuf"
 )
 
 // New creates a discovery server for all the given services.
 // The service descriptions must be registered using
 // RegisterDescriptorSetCompressed which is called by init() function
 // generated by github.com/luci/luci-go/grpc/cmd/cproto.
 func New(serviceNames ...string) (DiscoveryServer, error) {
         desc, err := combineDescriptors(serviceNames)
         if err != nil {
                 return nil, err
@@ skipping 55 matching lines @@
                         hash := sha1.Sum(binary)
                         if !seenFiles[hash] {
                                 result.File = append(result.File, f)
                                 seenFiles[hash] = true
                         }
 
                 }
         }
         return result, nil
 }