Revert of Restores larger output buffer size when output stream requiring smaller size is closed

media/audio/mac/audio_manager_mac.h

Index: media/audio/mac/audio_manager_mac.h
diff --git a/media/audio/mac/audio_manager_mac.h b/media/audio/mac/audio_manager_mac.h
index 28bd924b04b59de80da9f3371795e5bf587adcf9..f5159e956cc44a249af38a698cf4e3399969f6b5 100644
--- a/media/audio/mac/audio_manager_mac.h
+++ b/media/audio/mac/audio_manager_mac.h
@@ -10,7 +10,6 @@
 #include <stddef.h>
 
 #include <list>
-#include <map>
 #include <memory>
 #include <string>
 
@@ -128,24 +127,6 @@
   // sample rate has changed, otherwise does nothing.
   void HandleDeviceChanges();
 
-  // Returns true if any active input stream is using the specified |device_id|.
-  bool AudioDeviceIsUsedForInput(AudioDeviceID device_id);
-
-  // This method is called when an output stream has been released and it takes
-  // the given |device_id| and scans all active output streams that are
-  // using this id. The goal is to find a new (larger) I/O buffer size which
-  // can be applied to all active output streams since doing so will save
-  // system resources.
-  // Note that, it is only called if no input stream is also using the device.
-  // Example: two active output streams where #1 wants 1024 as buffer size but
-  // is using 256 since stream #2 wants it. Now, if stream #2 is closed down,
-  // the native I/O buffer size will be increased to 1024 instead of 256.
-  // Returns true if it was possible to increase the I/O buffer size and
-  // false otherwise.
-  // TODO(henrika): possibly extend the scheme to also take input streams into
-  // account.
-  bool IncreaseIOBufferSizeIfPossible(AudioDeviceID device_id);
-
   std::unique_ptr<AudioDeviceListenerMac> output_device_listener_;
 
   // Track the output sample-rate and the default output device
@@ -168,10 +149,6 @@
   std::list<AUAudioInputStream*> low_latency_input_streams_;
   std::list<AUHALStream*> output_streams_;
 
-  // Maps device IDs and their corresponding actual (I/O) buffer sizes for
-  // all output streams using the specific device.
-  std::map<AudioDeviceID, size_t> output_io_buffer_size_map_;
-
   DISALLOW_COPY_AND_ASSIGN(AudioManagerMac);
 };