Rename CoreAudioSharedInternalUnit::m_ioUnit to m_audioUnit

https://bugs.webkit.org/show_bug.cgi?id=274200
rdar://128111716

Reviewed by Eric Carlson.

CoreAudioSharedInternalUnit::m_ioUnit is conflicting with CoreAudioSharedUnit:m_ioUnit which makes the code less easy to read/search.
Renaming CoreAudioSharedInternalUnit::m_ioUnit to CoreAudioSharedInternalUnit::m_audioUnit instead.

* Source/WebCore/platform/mediastream/mac/CoreAudioSharedUnit.cpp:
(WebCore::CoreAudioSharedInternalUnit::CoreAudioSharedInternalUnit):
(WebCore::CoreAudioSharedInternalUnit::~CoreAudioSharedInternalUnit):
(WebCore::CoreAudioSharedInternalUnit::initialize):
(WebCore::CoreAudioSharedInternalUnit::uninitialize):
(WebCore::CoreAudioSharedInternalUnit::start):
(WebCore::CoreAudioSharedInternalUnit::stop):
(WebCore::CoreAudioSharedInternalUnit::set):
(WebCore::CoreAudioSharedInternalUnit::get):
(WebCore::CoreAudioSharedInternalUnit::render):

Canonical link: https://commits.webkit.org/278852@main

Source/WebCore/platform/mediastream/mac/CoreAudioSharedUnit.cpp

@@ -88,7 +88,7 @@ class CoreAudioSharedInternalUnit final :  public CoreAudioSharedUnit::InternalU
     OSStatus defaultInputDevice(uint32_t*) final;
     OSStatus defaultOutputDevice(uint32_t*) final;
 
-    CoreAudioSharedUnit::StoredAudioUnit m_ioUnit;
+    CoreAudioSharedUnit::StoredAudioUnit m_audioUnit;
     bool m_shouldUseVPIO { false };
 };
 
@@ -152,8 +152,8 @@ Expected<UniqueRef<CoreAudioSharedUnit::InternalUnit>, OSStatus> CoreAudioShared
     return result;
 }
 
-CoreAudioSharedInternalUnit::CoreAudioSharedInternalUnit(CoreAudioSharedUnit::StoredAudioUnit&& ioUnit, bool shouldUseVPIO)
-    : m_ioUnit(WTFMove(ioUnit))
+CoreAudioSharedInternalUnit::CoreAudioSharedInternalUnit(CoreAudioSharedUnit::StoredAudioUnit&& audioUnit, bool shouldUseVPIO)
+    : m_audioUnit(WTFMove(audioUnit))
     , m_shouldUseVPIO(shouldUseVPIO)
 {
 }
@@ -162,43 +162,43 @@ CoreAudioSharedInternalUnit::~CoreAudioSharedInternalUnit()
 {
 #if PLATFORM(MAC)
     if (m_shouldUseVPIO)
-        CoreAudioSharedUnit::unit().setStoredVPIOUnit(std::exchange(m_ioUnit, { }));
+        CoreAudioSharedUnit::unit().setStoredVPIOUnit(std::exchange(m_audioUnit, { }));
 #endif
 }
 
 OSStatus CoreAudioSharedInternalUnit::initialize()
 {
-    return PAL::AudioUnitInitialize(m_ioUnit.get());
+    return PAL::AudioUnitInitialize(m_audioUnit.get());
 }
 
 OSStatus CoreAudioSharedInternalUnit::uninitialize()
 {
-    return PAL::AudioUnitUninitialize(m_ioUnit.get());
+    return PAL::AudioUnitUninitialize(m_audioUnit.get());
 }
 
 OSStatus CoreAudioSharedInternalUnit::start()
 {
-    return PAL::AudioOutputUnitStart(m_ioUnit.get());
+    return PAL::AudioOutputUnitStart(m_audioUnit.get());
 }
 
 OSStatus CoreAudioSharedInternalUnit::stop()
 {
-    return PAL::AudioOutputUnitStop(m_ioUnit.get());
+    return PAL::AudioOutputUnitStop(m_audioUnit.get());
 }
 
 OSStatus CoreAudioSharedInternalUnit::set(AudioUnitPropertyID propertyID, AudioUnitScope scope, AudioUnitElement element, const void* value, UInt32 size)
 {
-    return PAL::AudioUnitSetProperty(m_ioUnit.get(), propertyID, scope, element, value, size);
+    return PAL::AudioUnitSetProperty(m_audioUnit.get(), propertyID, scope, element, value, size);
 }
 
 OSStatus CoreAudioSharedInternalUnit::get(AudioUnitPropertyID propertyID, AudioUnitScope scope, AudioUnitElement element, void* value, UInt32* size)
 {
-    return PAL::AudioUnitGetProperty(m_ioUnit.get(), propertyID, scope, element, value, size);
+    return PAL::AudioUnitGetProperty(m_audioUnit.get(), propertyID, scope, element, value, size);
 }
 
 OSStatus CoreAudioSharedInternalUnit::render(AudioUnitRenderActionFlags* ioActionFlags, const AudioTimeStamp* inTimeStamp, UInt32 inOutputBusNumber, UInt32 inNumberFrames, AudioBufferList* list)
 {
-    return PAL::AudioUnitRender(m_ioUnit.get(), ioActionFlags, inTimeStamp, inOutputBusNumber, inNumberFrames, list);
+    return PAL::AudioUnitRender(m_audioUnit.get(), ioActionFlags, inTimeStamp, inOutputBusNumber, inNumberFrames, list);
 }
 
 OSStatus CoreAudioSharedInternalUnit::defaultInputDevice(uint32_t* deviceID)