Firefox issue with property decorators

[sentyaev]

I'm submitting a ...

[ x ] bug report

Current behavior
When name of property is watch and this property marked with property decorator (Input or Output) in Firefox I see issue like unshift is not a function. I found that this line of code meta[name] = meta[name] || []; returns watch() function instead of property metadata.

Expected behavior
From my point of view watch is not a reserved name for variables or properties, so we should be able to create properties with name watch.

Minimal reproduction of the problem with instructions
This is only Firefox issue, in Chrome it works fine.
Plunker to reproduce: https://plnkr.co/edit/pL19LMYTJ27Th2zWUPLH

Please tell us about your environment: Windows 10, Firefox 49.0.1

• Angular version: 2.0.2
• Browser: Firefox 49.0.1
• Language: TypeScript 2.0.2

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