balancer/resolver: remove temporary backward-compatibility type aliases (grpc#3309)

Author: dfawley

balancer/balancer.go

@@ -203,11 +203,6 @@ type ConfigParser interface {
 	ParseConfig(LoadBalancingConfigJSON json.RawMessage) (serviceconfig.LoadBalancingConfig, error)
 }
 
-// PickOptions is a type alias of PickInfo for legacy reasons.
-//
-// Deprecated: use PickInfo instead.
-type PickOptions = PickInfo
-
 // PickInfo contains additional information for the Pick operation.
 type PickInfo struct {
 	// FullMethodName is the method name that NewClientStream() is called

resolver/resolver.go

@@ -124,11 +124,6 @@ type Address struct {
 	Metadata interface{}
 }
 
-// BuildOption is a type alias of BuildOptions for legacy reasons.
-//
-// Deprecated: use BuildOptions instead.
-type BuildOption = BuildOptions
-
 // BuildOptions includes additional information for the builder to create
 // the resolver.
 type BuildOptions struct {
@@ -235,11 +230,6 @@ type Builder interface {
 	Scheme() string
 }
 
-// ResolveNowOption is a type alias of ResolveNowOptions for legacy reasons.
-//
-// Deprecated: use ResolveNowOptions instead.
-type ResolveNowOption = ResolveNowOptions
-
 // ResolveNowOptions includes additional information for ResolveNow.
 type ResolveNowOptions struct{}