Revert of Add source column to chrome://policy showing the origins of policies. (patchset #15 id:540001 of https://codereview.chromium.org/1304843004/ )

Reason for revert:
breaks compilation on iOS Device (ninja)

Original issue's description:
> Add source column to chrome://policy showing the origins of policies.
>
> These are the possible sources for a policy:
> Cloud - Policy values received from the cloud.
> Platform - Local configured policies.
> Enterprise Default - Defaults for policies in enterprise environments
>                      on Chrome OS. Can be overridden.
> Enterprise Override - Policies enforced in enterprise environments on
>                       Chrome OS. Can NOT be overridden.
>
> The source of a policy is determined when it's first set. For cloud
> policies, this would be the decoding of the protocol buffers.
> Platform policies are usually set by loading platform-specific local
> configurations like entries in the Windows registry.
> Enterprise defaults are automatically set if the device is active in
> an enterprise environment.
> Enterprise override policies are set within the code to enforce
> specific behaviors (like ash tray visibility). They cannot be
> overridden.
>
> BUG=506123
> TBR=jam@chromium.org
>
> Committed: https://crrev.com/92e7960f06c2ac2ec0113bb88df3d322f0eb97fe
> Cr-Commit-Position: refs/heads/master@{#349654}

TBR=tnagel@chromium.org,bartfab@chromium.org,dbeam@chromium.org,fhorschig@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=506123

Review URL: https://codereview.chromium.org/1348903007

Cr-Commit-Position: refs/heads/master@{#349655}


CrOS-Libchrome-Original-Commit: cd10a8822ea05d981b67c7e9693b0132e3838cec
17 files changed
tree: 1144da78a0c50d731ad2a274394ceebe0269467b
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/