test(profiler): remove deprecated and unused now API (#3638)

Change-Id: I0211d72d1baab187756077bb66227bb83b4cd6f4

profiler/proftest/proftest.go

@@ -24,7 +24,6 @@ import (
 	"errors"
 	"fmt"
 	"io/ioutil"
-	"log"
 	"net/http"
 	"regexp"
 	"strconv"
@@ -506,17 +505,6 @@ func (tr *GCETestRunner) PollAndLogSerialPort(ctx context.Context, inst *Instanc
 	}
 }
 
-// PollForAndReturnSerialOutput is deprecated, use PollAndLogSerialPort.
-func (tr *GCETestRunner) PollForAndReturnSerialOutput(ctx context.Context, inst *InstanceConfig, finishString, errorString string) (string, error) {
-	return tr.PollAndLogSerialPort(ctx, inst, finishString, errorString, log.Printf)
-}
-
-// PollForSerialOutput is deprecated, use PollAndLogSerialPort.
-func (tr *GCETestRunner) PollForSerialOutput(ctx context.Context, inst *InstanceConfig, finishString, errorString string) error {
-	_, err := tr.PollAndLogSerialPort(ctx, inst, finishString, errorString, log.Printf)
-	return err
-}
-
 // QueryProfiles retrieves profiles of a specific type, from a specific time
 // range, associated with a particular service and project.
 func (tr *TestRunner) QueryProfiles(projectID, service, startTime, endTime, profileType string) (ProfileResponse, error) {