Revert of Enable the volume slider in Ash for windows.

ash/system/win/audio/tray_audio_delegate_win.cc

Index: ash/system/win/audio/tray_audio_delegate_win.cc
diff --git a/ash/system/win/audio/tray_audio_delegate_win.cc b/ash/system/win/audio/tray_audio_delegate_win.cc
deleted file mode 100644
index 57c7b56307e86ebff36b63473dbd28ddcb468cee..0000000000000000000000000000000000000000
--- a/ash/system/win/audio/tray_audio_delegate_win.cc
+++ /dev/null
@@ -1,117 +0,0 @@
-// 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.
-
-#include "ash/system/win/audio/tray_audio_delegate_win.h"
-
-#include <audiopolicy.h>
-#include <cmath>
-
-#include "grit/ash_resources.h"
-#include "grit/ash_strings.h"
-#include "media/audio/win/core_audio_util_win.h"
-
-using base::win::ScopedComPtr;
-
-namespace {
-
-// Volume value which should be considered as muted in range [0, 100].
-const int kMuteThresholdPercent = 1;
-
-// Lowest volume which is considered to be audible in the range [0, 100].
-const int kDefaultUnmuteVolumePercent = 4;
-
-}  // namespace
-
-namespace ash  {
-namespace system {
-
-void TrayAudioDelegateWin::AdjustOutputVolumeToAudibleLevel() {
-  if (GetOutputVolumeLevel() <= kMuteThresholdPercent)
-    SetOutputVolumeLevel(kDefaultUnmuteVolumePercent);
-}
-
-int TrayAudioDelegateWin::GetOutputDefaultVolumeMuteLevel() {
-  return kMuteThresholdPercent;
-}
-
-int TrayAudioDelegateWin::GetOutputVolumeLevel() {
-  ScopedComPtr<ISimpleAudioVolume> volume_control =
-      CreateDefaultVolumeControl();
-  if (!volume_control)
-    return 0;
-
-  float level = 0.0f;
-  if (FAILED(volume_control->GetMasterVolume(&level)))
-    return 0;
-
-  // MSVC prior to 2013 doesn't have a round function.  The below code is not
-  // conformant to C99 round(), but since we know that 0 <= level <= 100, it
-  // should be ok.
-  return static_cast<int>(level + 0.5);
-}
-
-int TrayAudioDelegateWin::GetActiveOutputDeviceIconId() {
-  return kNoAudioDeviceIcon;
-}
-
-bool TrayAudioDelegateWin::HasAlternativeSources() {
-  return false;
-}
-
-bool TrayAudioDelegateWin::IsOutputAudioMuted() {
-  ScopedComPtr<ISimpleAudioVolume> volume_control =
-      CreateDefaultVolumeControl();
-
-  if (!volume_control)
-    return false;
-
-  BOOL mute = FALSE;
-  if (FAILED(volume_control->GetMute(&mute)))
-    return false;
-
-  return !!mute;
-}
-
-void TrayAudioDelegateWin::SetOutputAudioIsMuted(bool is_muted) {
-  ScopedComPtr<ISimpleAudioVolume> volume_control =
-      CreateDefaultVolumeControl();
-
-  if (!volume_control)
-    return;
-
-  volume_control->SetMute(is_muted, NULL);
-}
-
-void TrayAudioDelegateWin::SetOutputVolumeLevel(int level) {
-  ScopedComPtr<ISimpleAudioVolume> volume_control =
-      CreateDefaultVolumeControl();
-
-  if (!volume_control)
-    return;
-
-  float volume_level = static_cast<float>(level) / 100.0f;
-  volume_control->SetMasterVolume(volume_level, NULL);
-}
-
-ScopedComPtr<ISimpleAudioVolume>
-TrayAudioDelegateWin::CreateDefaultVolumeControl() {
-  ScopedComPtr<ISimpleAudioVolume> volume_control;
-  ScopedComPtr<IAudioSessionManager> session_manager;
-
-  ScopedComPtr<IMMDevice> device =
-      media::CoreAudioUtil::CreateDefaultDevice(eRender, eConsole);
-  if (!device ||
-      FAILED(device->Activate(__uuidof(IAudioSessionManager), CLSCTX_ALL, NULL,
-             session_manager.ReceiveVoid()))) {
-    return volume_control;
-  }
-
-  session_manager->GetSimpleAudioVolume(NULL, FALSE,
-      volume_control.Receive());
-
-  return volume_control;
-}
-
-}  // namespace system
-}  // namespace ash