Cherry-pick: base: Default android version to 4.4.99
Cherry-pick: base: Default android version to 4.4.99

Cherry-pick of https://codereview.chromium.org/381813002/

Original description:

Under-development Android versions do not have a numeric
version, so falls back to a "default version".

Using a real released Android version like 4.3.0 will
incorrectly trigger code paths, such has version-specific
gpu blacklists.

First attempt at fixing this was using 0.0.0, which caused
websites parsing Android version in the user agent to break.

So this is the second attempt, use the latest public major
version and minor version, and use a higher bug release
version to avoid conflicts with the gpu blacklist.

BUG: 16162131
Change-Id: Icbc68fbe118311b806f41a17593e9f3bc2a2f069

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rnal_chromium_org