Revert of Make more media APIs aware of |delay| and |delay_timestamp|

media/audio/audio_device_thread.h

Index: media/audio/audio_device_thread.h
diff --git a/media/audio/audio_device_thread.h b/media/audio/audio_device_thread.h
index 43cc160836a1e30598fa677d58560b62486d8d6d..f3287ef39ccf86705642dc5439f7b13860737f1d 100644
--- a/media/audio/audio_device_thread.h
+++ b/media/audio/audio_device_thread.h
@@ -42,8 +42,7 @@
     virtual void MapSharedMemory() = 0;
 
     // Called whenever we receive notifications about pending input data.
-    virtual void Process(int64_t pending_data,
-                         base::TimeTicks data_timestamp) = 0;
+    virtual void Process(uint32_t pending_data) = 0;
 
    protected:
     virtual ~Callback();
@@ -76,12 +75,6 @@
   // synchronous process and the thread will stop before the method returns.
   ~AudioDeviceThread() override;
 
-  // Represents a data packet to be received via the socket.
-  struct Packet {
-    int64_t pending_data;
-    int64_t data_timestamp_us;
-  };
-
  private:
   void ThreadMain() final;