Inline ve.dm.Document.offsetContainsAnnotation

Resolves TODO

ve.dm.Document.js
* Removed offsetContainsAnnotation method
* Inlined uses of removed method

ve.dm.Transaction.js
* Inlined uses of removed method

ve.dm.Document.test.js
* Removed test for removed method

Change-Id: Ie970234ad5d8c0417389b8a45defec9fd5be6a79
Merge "Inline ve.dm.Document.offsetContainsAnnotation"