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mw.storage: Fix broken test (incompatible with Chrome 45)

Description

mw.storage: Fix broken test (incompatible with Chrome 45)

The localStorage global is read-only which Chrome 45 enforces.

Simplify things by dropping mediaWiki.storage.isStorageEnabled, and
by wrapping each operation with a try / catch.

Bug: T113413
Change-Id: Iecbdeb050b9a69febd3388898d98293a84588a94

Details