Apps keep crashing after OS X update
It seems that I've fixed it.
I made this steps:


Restore /System/Library/Frameworks/WebKit.framework/ from a Time Machine backup.


This fixed all the crashes but now is quite impossible to close Safari tabs or the program itself.

Reinstall OS X 10.10.5 update. It is available for download here or here as combo update.


This fixed everything.
As mentioned below in comment, the combo updater runs checks and balances for every update between the 10.10.0 and the current version. This is the best solution.



I think that is sufficient to perform only the step 2.