GitLab

Get changes from the internal repo since last branch point:
- Replace hardcoded company name with COMPANY_SHORTNAME_STRING
- Add more paths to PreFetchedPaths
- Replace some VLOG statements with LOG(INFO)
- Enforce that RegKeyPath takes only predefined keys in rootkey
- Add chrome-cleanup-tool-test to keys in registry unit tests
- Add Chrome policy key constants to registry_util.h
- Replace StringPrintf with StrCat

R=csharp

Bug: 830892
Change-Id: I71c0c3f03ce852c4af4738056187512cfea9f82e
Reviewed-on: https://chromium-review.googlesource.com/1195802Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Joe Mason <joenotcharles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587692}