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Revert of Third attempt to land change to remove NativeViewportService and (patchset #2 id:20001 of https://codereview.chromium.org/578353002/)

Reason for revert:
all these tests are timing out on Win7 Tests (dbg)(4):mojo_view_manager_unittests -
https://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20(dbg)(4)/builds/28279

ViewManagerTest.CantAccessChildrenOfEmbeddedView
ViewManagerTest.SecondEmbedRoot_Service
ViewManagerTest.EmbedWithSameViewId2
ViewManagerTest.EmbedWithSameViewId
ViewManagerTest.ViewsRemovedWhenEmbedding
ViewManagerTest.CantGetViewTreeOfOtherRoots
ViewManagerTest.SetViewVisibilityNotifications
ViewManagerTest.CreateView
ViewManagerTest.ViewHierarchyChangedAddingKnownToUnknown
ViewManagerTest.GetViewTree
ViewManagerTest.ViewHierarchyChangedViews
ViewManagerTest.ReuseDeletedViewId
ViewManagerTest.AddViewWithNoChange
ViewManagerTest.ReorderView
ViewManagerTest.SetViewVisibility
ViewManagerTest.CantModifyChildrenOfEmbeddedView
ViewManagerTest.OnViewInput
ViewManagerTest.CantMoveViewsFromOtherRoot
ViewManagerTest.TwoClientsGetDifferentConnectionIds
ViewManagerTest.SetViewBounds

Original issue's description:
> Third attempt to land change to remove NativeViewportService and
> ViewManager from mojo_shell.
>
> Original cl was https://codereview.chromium.org/477923004/
>
> BUG=
> TBR=ben@chromium.org
>
> Committed: https://crrev.com/9b5afe9fda3e59c856cbfc43367c2719df676af0
> Cr-Commit-Position: refs/heads/master@{#295537}

TBR=davemoore@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/577403002

Cr-Commit-Position: refs/heads/master@{#295568}