REGRESSION (r244091): Leak of TaskStateChangedCallbackType due to missing -dealloc

[David Kilzer (:ddkilzer)]

Leak of TaskStateChangedCallbackType due to missing -dealloc.

Found by clang static analyzer:

'WKProcessTaskStateObserverDelegate' lacks a 'dealloc' instance method but must release '_taskStateChangedCallback'

Regressed with the fix for Bug 196659 in r244091:

Bug 196659: [Cocoa] Awaken UIProcess if WebContent process is awakened from suspensions unexpectedly.
<https://bugs.webkit.org/show_bug.cgi?id=196659>
<rdar://problem/49745738>
<https://trac.webkit.org/r244091>

[Radar WebKit Bug Importer]

<rdar://problem/61992856>

[David Kilzer (:ddkilzer)]

Created attachment 396887 [details]
Patch v1

[David Kilzer (:ddkilzer)]

Comment on attachment 396887 [details]
Patch v1

View in context: https://bugs.webkit.org/attachment.cgi?id=396887&action=review

> Source/WebKit/Shared/Cocoa/ProcessTaskStateObserver.mm:46
> +- (void)dealloc

I chose to implement dealloc because using RetainPtr<> would require an instance variable and a custom getter (and maybe a setter).

When switching to ARC, we simply delete the -dealloc method and the @property will work as expected.

[Darin Adler]

Comment on attachment 396887 [details]
Patch v1

View in context: https://bugs.webkit.org/attachment.cgi?id=396887&action=review

> Source/WebKit/Shared/Cocoa/ProcessTaskStateObserver.mm:49
> +    _taskStateChangedCallback = nil;

Seems unnecessary to set things to nil in dealloc.

[David Kilzer (:ddkilzer)]

Created attachment 396935 [details]
Patch for landing

[EWS]

Committed r260348: <https://trac.webkit.org/changeset/260348>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 396935 [details].