Bug 1733109 - narrowing conversion from 'double' to 'float' in HTMLMediaElement.cpp. r=alwu

Depends on D126945

Differential Revision: https://phabricator.services.mozilla.com/D126946

dom/html/HTMLMediaElement.cpp

@@ -7155,7 +7155,7 @@ void HTMLMediaElement::SetDecoder(MediaDecoder* aDecoder) {
 float HTMLMediaElement::ComputedVolume() const {
   return mMuted                 ? 0.0f
          : mAudioChannelWrapper ? mAudioChannelWrapper->GetEffectiveVolume()
-                                : mVolume;
+                                : static_cast<float>(mVolume);
 }
 
 bool HTMLMediaElement::ComputedMuted() const {