media: Remove SetCdmReadyCB and CdmReadyCB (part 1).

media/base/test_helpers.h

 // Copyright (c) 2012 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.
 
 #ifndef MEDIA_BASE_TEST_HELPERS_H_
 #define MEDIA_BASE_TEST_HELPERS_H_
 
 #include <stddef.h>
 
 #include "base/callback.h"
@@ skipping 115 matching lines @@
 // some sanity check.
 scoped_refptr<DecoderBuffer> CreateFakeVideoBufferForTest(
     const VideoDecoderConfig& config,
     base::TimeDelta timestamp,
     base::TimeDelta duration);
 
 // Verify if a fake video DecoderBuffer is valid.
 bool VerifyFakeVideoBufferForTest(const scoped_refptr<DecoderBuffer>& buffer,
                                   const VideoDecoderConfig& config);
 
-// Used to verify that the each call to A() is followed by a call to B(),
-// before the next call to A(). There may be any number of pairs (including 0).
-class CallbackPairChecker {
- public:
-  CallbackPairChecker();
-  ~CallbackPairChecker();
-  void RecordACalled();
-  void RecordBCalled();
-
- private:
-  bool expecting_b_;
-};
-
 }  // namespace media
 
 #endif  // MEDIA_BASE_TEST_HELPERS_H_