free weakref to linearblock when it is destroy
bug: 168331789 Test: Manual Change-Id: Iee1b2618bd5c970b728dbc0301b84ff43debde58 Merged-In: Iee1b2618bd5c970b728dbc0301b84ff43debde58
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bug: 168331789 Test: Manual Change-Id: Iee1b2618bd5c970b728dbc0301b84ff43debde58 Merged-In: Iee1b2618bd5c970b728dbc0301b84ff43debde58