Revert 285209 "Cleanups for aura/test/event_generator.h (resolve..."

Revert 285209 "Cleanups for aura/test/event_generator.h (resolve..."

> Cleanups for aura/test/event_generator.h (resolve TODOs)
> 
> Some purely mechanical changes left over from r283694, now that
> aura::test::EventGenerator has moved to ui::test in src/ui/events.
> 
> Moves aura/test/event_generator.* to event_generator_delegate_aura.*
> Removes `using ui::test::EventGenerator;` declaration and redirects
> includes that don't extend the delegate to include the ui/test
> event_generator.h directly
> 
> BUG=378134
> 
> Review URL: https://codereview.chromium.org/406413004

TBR=tapted@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285222

[markusheintz_, 2014-07-24 13:18:45]

Committed patchset #1 manually as r285222 (tree was closed).

[tapted, 2014-07-24 13:20:16]

lgtm - thanks