grpc: un-deprecate Dial and DialContext

Author: dfawley

clientconn.go

@@ -196,8 +196,6 @@ func NewClient(target string, opts ...DialOption) (conn *ClientConn, err error)
 }
 
 // Dial calls DialContext(context.Background(), target, opts...).
-//
-// Deprecated: use NewClient instead.  Will be supported throughout 1.x.
 func Dial(target string, opts ...DialOption) (*ClientConn, error) {
 	return DialContext(context.Background(), target, opts...)
 }
@@ -211,8 +209,6 @@ func Dial(target string, opts ...DialOption) (*ClientConn, error) {
 // "passthrough" for backward compatibility.  This distinction should not matter
 // to most users, but could matter to legacy users that specify a custom dialer
 // and expect it to receive the target string directly.
-//
-// Deprecated: use NewClient instead.  Will be supported throughout 1.x.
 func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *ClientConn, err error) {
 	// At the end of this method, we kick the channel out of idle, rather than
 	// waiting for the first rpc.