ref/lib/apilog: no longer need to log the file:line info in apilog output.

Change-Id: I4f3f76783f8b7c83aa1251e52506178257a0edf2
diff --git a/lib/apilog/apilog.go b/lib/apilog/apilog.go
index 0ab9f7b..c75f8cb 100644
--- a/lib/apilog/apilog.go
+++ b/lib/apilog/apilog.go
@@ -14,10 +14,8 @@
 import (
 	"fmt"
 	"path"
-	"path/filepath"
 	"reflect"
 	"runtime"
-	"strconv"
 	"sync/atomic"
 
 	"v.io/x/lib/vlog"
@@ -37,14 +35,14 @@
 func callerLocation() string {
 	var funcName string
 	const stackSkip = 1
-	pc, file, line, ok := runtime.Caller(stackSkip + 1)
+	pc, _, _, ok := runtime.Caller(stackSkip + 1)
 	if ok {
 		function := runtime.FuncForPC(pc)
 		if function != nil {
 			funcName = path.Base(function.Name())
 		}
 	}
-	return filepath.Base(file) + ":" + strconv.Itoa(line) + " " + funcName
+	return funcName
 }
 
 // TODO(cnicolaou): remove LogCall from vlog.
diff --git a/lib/apilog/apilog_test.go b/lib/apilog/apilog_test.go
index 2157fae..7debc4c 100644
--- a/lib/apilog/apilog_test.go
+++ b/lib/apilog/apilog_test.go
@@ -10,7 +10,6 @@
 	"os"
 	"path/filepath"
 	"regexp"
-	"strings"
 	"testing"
 
 	"v.io/x/lib/vlog"
@@ -68,14 +67,14 @@
 	if want, got := 2, len(contents); want != got {
 		t.Errorf("Expected %d info lines, got %d instead", want, got)
 	}
-	logCallLineRE := regexp.MustCompile(`\S+ \S+\s+\S+ ([^:]*):.*(call|return)\[(\S*) (\S*)`)
+	logCallLineRE := regexp.MustCompile(`\S+ \S+\s+\S+ ([^:]*):.*(call|return)\[(\S*)`)
 	for _, line := range contents {
 		match := logCallLineRE.FindStringSubmatch(line)
-		if len(match) != 5 {
+		if len(match) != 4 {
 			t.Errorf("failed to match %s", line)
 			continue
 		}
-		fileName, callType, location, funcName := match[1], match[2], match[3], match[4]
+		fileName, callType, funcName := match[1], match[2], match[3]
 		if fileName != "apilog_test.go" {
 			t.Errorf("unexpected file name: %s", fileName)
 			continue
@@ -83,9 +82,6 @@
 		if callType != "call" && callType != "return" {
 			t.Errorf("unexpected call type: %s", callType)
 		}
-		if !strings.HasPrefix(location, "apilog_test.go:") {
-			t.Errorf("unexpected location: %s", location)
-		}
 		if funcName != "apilog_test.myLoggedFunc" {
 			t.Errorf("unexpected func name: %s", funcName)
 		}