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This required some changes to WeakPtr to support the addition
of WeakPtrFactory::HasWeakPtrs(), which is used to implement
ScopedRunnableMethodFactory::empty().
Now, the WeakReferenceOwner just holds a pointer to the Flag
class, and the Flag holds a back-pointer that it can use to
clear the WeakReferenceOwner's pointer when the Flag is
destroyed. I use the null'ness of this back-pointer in place
of the bool member that was previously used to indicate if the
WeakReference is valid.
It was also necessary to expose a HasOneRef method on
RefCounted. I included one on RefCountedThreadSafe for
completeness.
Finally, I switched HttpCache over to using WeakPtr instead
of RevocableStore so that I could delete RevocableStore.
(I'm making this change to consolidate similar functionality.)
R=abarth
BUG=none
TEST=none
Review URL: http://codereview.chromium.org/235027
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@27287 0039d316-1c4b-4281-b951-d872f2087c98
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