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Remove overengineered page update code from ChangeHandler

Description

Remove overengineered page update code from ChangeHandler

We initially anticipated that we could optimize page updates
based on the kind of change that was propagated from the repository.

We ended up always performign all updates for all changes anyway.
This made a whole lot of code redundant.

Change-Id: I19f29d7784fae19c544a6a69c220cc2ccb0edcdc