Lazily prune the multibuffer block cache.

media/base/fake_single_thread_task_runner.h

Index: media/base/fake_single_thread_task_runner.h
diff --git a/media/cast/test/fake_single_thread_task_runner.h b/media/base/fake_single_thread_task_runner.h
similarity index 96%
rename from media/cast/test/fake_single_thread_task_runner.h
rename to media/base/fake_single_thread_task_runner.h
index 9a6e6b685d2c8b43a39579221a5a1da55307fd7f..a9be9736fd7704b16ef4d7d2b32e0bbdc4c7da07 100644
--- a/media/cast/test/fake_single_thread_task_runner.h
+++ b/media/base/fake_single_thread_task_runner.h
@@ -13,8 +13,6 @@
 #include "base/test/simple_test_tick_clock.h"
 
 namespace media {
-namespace cast {
-namespace test {
 
 class FakeSingleThreadTaskRunner : public base::SingleThreadTaskRunner {
  public:
@@ -58,8 +56,6 @@ class FakeSingleThreadTaskRunner : public base::SingleThreadTaskRunner {
   DISALLOW_COPY_AND_ASSIGN(FakeSingleThreadTaskRunner);
 };
 
-}  // namespace test
-}  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_TEST_FAKE_TASK_RUNNER_H_