Revert 271468 "Revert of [Refactor] Consolidate the logic for wh..."

Revert 271468 "Revert of [Refactor] Consolidate the logic for wh..."

The revert broke Windows interactive_ui_tests. The world has probably
changed since this was first committed.

WidgetTestInteractive.CanActivateFlagIsHonored

http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%281%29/builds/29193/steps/interactive_ui_tests/logs/stdio

> Revert of [Refactor] Consolidate the logic for whether a widget can be activated. (https://codereview.chromium.org/286733002/)
> 
> Reason for revert:
> This CL was causing problems when the value of views::Widget::CanActivate() changes crbug.com/374095
> 
> I also need to audit the code to find out whether there are any 'non-activatable' widgets which were intended to be activatable
> 
> Original issue's description:
> > [Refactor] Consolidate the logic for whether a widget can be activated.
> >
> > This is a first step towards giving tooltips their own WindowTreeHosts on Linux.
> >
> > BUG=353533
> > TEST=None
> >
> > Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=270597
> 
> Review URL: https://codereview.chromium.org/297503003

TBR=pkotwicz@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271511

[Elliot Glaysher, 2014-05-19 22:59:10]

Committed patchset #1 manually as r271511 (tree was closed).