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This change splits ChromiumEnv into two classes: ChromiumEnv/ChromiumEnvPosix.
ChromiumEnvWin32 was also added which uses the Win32 API - except for logging.

The default is to create POSIX environments for all platforms for non-IDB
LevelDB users. For IDB we create a Windows environment on Windows, else a
POSIX environment like before.

BUG=222623

Review URL: https://codereview.chromium.org/113373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245135 0039d316-1c4b-4281-b951-d872f2087c98