Andrey Lushnikov a363a733b7

feat: Introduce BrowserFetcher class (#1983) ...

This patch introduces `BrowserFetcher` class that manages
downloaded versions of products.

This patch:
- shapes Downloader API to be minimal yet usable for our needs. This
  includes removing such methods as `Downloader.supportedPlatforms` and
  `Downloader.defaultRevision`.
- makes most of the fs-related methods in Downloader async. The only
  exception is the `Downloader.revisionInfo`: it has stay sync due to the
  `pptr.executablePath()` method being sync.
- updates `install.js` and `utils/check_availability.js` to use new API
- finally, renames `Downloader` into `BrowserFetcher`

Fixes #1748.

2018-02-07 12:31:53 -05:00

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