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This reverts commit 414b62b0.

Reason for revert: Regresses a test on Mac.

Bug: 1110239

Original change's description:
> Set initial focus on session restore
> 
> Issue:
> - When On startup setting is set to "Continue where you left off",
> the initial focus is not set after launching the browser.
> - Users have to press Tab to focus the window.
> - This affects users who rely on screen readers since the window
> information is not announced on launch (on UIA mode).
> 
> More context:
> - The line calling SetInitialFocus was previously in the code but got
> removed after a startup focus refactor:
> https://chromium-review.googlesource.com/c/chromium/src/+/1313728
> - The refactor added the call to RestoreFocus on
> BrowserView::OnWidgetActivationChanged if the property
> restore_focus_on_activation_ is set to True. This property gets set
> during BrowserView::Show, but only in the case of session restore,
> Show gets called after OnWidgetActivationChanged so RestoreFocus is
> never called.
> - The inverted call stack on session restore is because AddRestoredTab
> on browser_tabrestore calls Activate before showing the window.
> 
> Fix:
> - Similar to what we currently have for MacOS, only call Activate
> in AddRestoredTab if it is not |from_session_restore|. This way Show
> will be called before Activate and thus focus will be set as
> expected.
> - This change is only made on Windows due to a couple of reasons
> 1) crbug.com/1102685 is only present on this platform.
> 2) Making this change on Linux would re-introduce crbug.com/1019048.
> 
> Bug: 1102685
> Change-Id: I6e62ebad7693eb5d908770364ba7c8d755ccaa70
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2284382
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Commit-Queue: Maria Villarreal <mavill@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#791950}

TBR=xiyuan@chromium.org,sky@chromium.org,fdoray@chromium.org,mavill@microsoft.com

Change-Id: I258891124447cb71b163b35452b84b999857cf96
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1102685
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2322266Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792176}