Modify the volume visuals:

chrome/browser/ui/views/ash/volume_controller_chromeos.cc

Index: chrome/browser/ui/views/ash/volume_controller_chromeos.cc
diff --git a/chrome/browser/ui/views/ash/volume_controller_chromeos.cc b/chrome/browser/ui/views/ash/volume_controller_chromeos.cc
index d789dd07ec20407c6fd73b3417e36022698bc65b..37738ce53c47a044b00b7d4b4b0a029336311dfe 100644
--- a/chrome/browser/ui/views/ash/volume_controller_chromeos.cc
+++ b/chrome/browser/ui/views/ash/volume_controller_chromeos.cc
@@ -71,9 +71,6 @@ bool VolumeController::HandleVolumeUp(const ui::Accelerator& accelerator) {
 
 void VolumeController::SetVolumePercent(double percent) {
   chromeos::AudioHandler* audio_handler = chromeos::AudioHandler::GetInstance();
-  if (audio_handler->IsMuted()) {
-    audio_handler->SetMuted(false);
-  }
   audio_handler->SetVolumePercent(percent);
   extensions::DispatchVolumeChangedEvent(audio_handler->GetVolumePercent(),
                                          audio_handler->IsMuted());