Change gae to apache 2 license.

filter/featureBreaker/featurebreaker.go

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
+// Copyright 2015 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 featureBreaker
 
 import (
         "errors"
         "fmt"
         "runtime"
         "strings"
         "sync"
 )
@@ skipping 94 matching lines @@
         }
 
         return f()
 }
 
 func (s *state) noBrokenFeatures() bool {
         s.Lock()
         defer s.Unlock()
         return len(s.broken) == 0
 }