GitLab

The original CL had some relative FilePaths that started with a '/'.
This caused browser tests to fail when run in debug mode. This is now
fixed by deleting the leading '/' characters.

Original change's description:
> Add mock policy option to extension install mixin
>
> Add an option to initialize ExtensionForceInstallMixin with a
> MockConfigurationPolicyProvider.
> Use this option in ForceInstalledAffiliatedExtensionApiTest.
> Add mixin support to ForceInstalledAffiliatedExtensionApiTest.
>
> Bug: 1090941
> Change-Id: Ieea931c108e091679be607045f405b55f4186a57
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416453
> Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
> Reviewed-by: David Bertoni <dbertoni@chromium.org>
> Reviewed-by: Omar Morsi <omorsi@google.com>
> Commit-Queue: Fabian Sommer <fabiansommer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#808281}

Bug: 1090941
Change-Id: I4803c1de248b40e22a0194aa9e98182cb5ae1ed8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2540586Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: David Bertoni <dbertoni@chromium.org>
Commit-Queue: Fabian Sommer <fabiansommer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828163}