b8ecb32

[Site Isolation] Fix TestWebKitAPI.WKWebsiteDataStore.* tests
https://bugs.webkit.org/show_bug.cgi?id=319420
rdar://182245093

Reviewed by NOBODY (OOPS!).

Tests like WKWebsiteDataStore.ListIdentifiers is failing under Site Isolation because WebProcessProxy is still alive
after WebPageProxy is closed, holding WebsiteDataStore and thus NetworkProcessProxy alive. This is a leak because
web process or network process should exit when clients close all WKWebViews.

Investigation indicates the reference chain is:
AudioHardwareListener / AudioSession => RemoteMediaSessionManagerProxy => WebProcessProxy.
So the bug is RemoteMediaSessionManagerProxy registers itself as global singleton AudioSession::sharedAudioSession()
(which is a strong ref) when is is being created by WebPageProxy, but it does not clear the reference when WebPageProxy
is closed. This causes leakage of WebProcessProxy (and other objects) as RemoteMediaSessionManagerProxy holds strong
ref to WebProcessProxy.

To fix this leak, add AudioSession::clearSharedSession() and call it from a new
RemoteMediaSessionManagerProxy::invalidate(), which runs both from the destructor and from WebPageProxy::resetState()
when the manager is torn down ahead of a process swap, breaking the cycle before the swap can strand a live process
reference.

Also, stop caching a strong Ref<WebProcessProxy> in RemoteMediaSessionManagerProxy and instead derive the process on
demand from the page's WeakPtr, matching how the sibling proxies (WebFullScreenManagerProxy,
VideoPresentationManagerProxy, PlaybackSessionManagerProxy) already do it. This removes the last strong ref to
WebProcessProxy the manager was holding.

* Source/WebCore/platform/audio/AudioSession.cpp:
(WebCore::AudioSession::clearSharedSession):
* Source/WebCore/platform/audio/AudioSession.h:
* Source/WebKit/UIProcess/Media/RemoteMediaSessionManagerProxy.cpp:
(WebKit::currentAudioHardwareListenerCreator):
(WebKit::RemoteMediaSessionManagerProxy::RemoteMediaSessionManagerProxy):
(WebKit::RemoteMediaSessionManagerProxy::~RemoteMediaSessionManagerProxy):
(WebKit::RemoteMediaSessionManagerProxy::invalidate):
(WebKit::RemoteMediaSessionManagerProxy::process const):
(WebKit::RemoteMediaSessionManagerProxy::messageSenderConnection const):
(WebKit::RemoteMediaSessionManagerProxy::sharedPreferencesForWebProcess const):
* Source/WebKit/UIProcess/Media/RemoteMediaSessionManagerProxy.h:
(WebKit::RemoteMediaSessionManagerProxy::process const): Deleted.
* Source/WebKit/UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::resetState):

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