Windows install_static refactor.

This change introduces install_static::InstallDetails, a module-global
holder of details relating to the current install. It also more clearly
defines the concept of a primary install mode and one or more secondary
install modes (e.g., "Chrome SxS" for Google Chrome's canary channel).
Furthermore, it creates a clear boundary for brand-specific constants so
that Chromium and Google Chrome don't bleed into one another. See
chrome/install_static/ for more information.


Cr-Original-Commit-Position: refs/heads/master@{#430728}
Cr-Commit-Position: refs/heads/master@{#432270}
37 files changed