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Revert of Cache IsNonBrowserProcess values, so we only take a loader-lock the first time. (patchset #4 id:60001 of https://codereview.chromium.org/1132473003/)

Reason for revert:
Possibly causing mysterious fails on the Win DBG bots:
https://build.chromium.org/p/chromium.webkit/builders/Win7%20%28dbg%29/builds/16344

http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/37896

Original issue's description:
> Cache IsNonBrowserProcess values, so we only take a loader-lock the first time.
>
> BUG=485656,477137
>
> Committed: https://crrev.com/78d41b5d4e59dc7d52d7e7d6530fdd0a78b36d33
> Cr-Commit-Position: refs/heads/master@{#329246}

TBR=siggi@chromium.org,grt@chromium.org,csharp@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=485656,477137

Review URL: https://codereview.chromium.org/1134253002

Cr-Commit-Position: refs/heads/master@{#329467}