Lazily prune the multibuffer block cache.

media/cast/cast_testing.gypi

 # Copyright 2014 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.
 
 {
   'includes': [ 'cast_testing_tools.gypi' ],
   'targets': [
     {
       # GN version: //media/cast:test_support
       'target_name': 'cast_test_utility',
       'type': 'static_library',
       'include_dirs': [
          '<(DEPTH)/',
       ],
       'dependencies': [
         'cast_net',
         'cast_receiver',
         '<(DEPTH)/base/base.gyp:test_support_base',
         '<(DEPTH)/media/media.gyp:media_test_support',
         '<(DEPTH)/testing/gtest.gyp:gtest',
         '<(DEPTH)/third_party/libyuv/libyuv.gyp:libyuv',
         '<(DEPTH)/third_party/mt19937ar/mt19937ar.gyp:mt19937ar',
         '<(DEPTH)/ui/gfx/gfx.gyp:gfx_test_support',
       ],
       'sources': [
         'test/fake_receiver_time_offset_estimator.cc',
         'test/fake_receiver_time_offset_estimator.h',
-        'test/fake_single_thread_task_runner.cc',
-        'test/fake_single_thread_task_runner.h',
         'test/loopback_transport.cc',
         'test/loopback_transport.h',
         'test/skewed_single_thread_task_runner.cc',
         'test/skewed_single_thread_task_runner.h',
         'test/skewed_tick_clock.cc',
         'test/skewed_tick_clock.h',
         'test/utility/audio_utility.cc',
         'test/utility/audio_utility.h',
         'test/utility/barcode.cc',
         'test/utility/barcode.h',
@@ skipping 170 matching lines @@
                   '<(DEPTH)/tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }], # test_isolation_mode != "noop"
   ], # conditions
 }