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

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285209

Review URL: https://codereview.chromium.org/406413004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285857 0039d316-1c4b-4281-b951-d872f2087c98

• ash/accelerators/accelerator_controller_unittest.cc[diff]
• ash/accelerators/accelerator_filter_unittest.cc[diff]
• ash/accelerators/magnifier_key_scroller_unittest.cc[diff]
• ash/accelerators/spoken_feedback_toggler_unittest.cc[diff]
• ash/autoclick/autoclick_unittest.cc[diff]
• ash/display/display_controller_unittest.cc[diff]
• ash/display/display_manager_unittest.cc[diff]
• ash/display/mirror_window_controller_unittest.cc[diff]
• ash/display/root_window_transformers_unittest.cc[diff]
• ash/drag_drop/drag_drop_controller_unittest.cc[diff]
• ash/extended_desktop_unittest.cc[diff]
• ash/first_run/first_run_helper_unittest.cc[diff]
• ash/focus_cycler_unittest.cc[diff]
• ash/frame/caption_buttons/frame_size_button_unittest.cc[diff]
• ash/ime/candidate_view_unittest.cc[diff]
• ash/magnifier/magnification_controller_unittest.cc[diff]
• ash/root_window_controller_unittest.cc[diff]
• ash/shelf/shelf_layout_manager_unittest.cc[diff]
• ash/shelf/shelf_view_unittest.cc[diff]
• ash/shell_unittest.cc[diff]
• ash/system/tray/system_tray_unittest.cc[diff]
• ash/system/user/tray_user_unittest.cc[diff]
• ash/system/web_notification/web_notification_tray_unittest.cc[diff]
• ash/test/ash_test_base.cc[diff]
• ash/tooltips/tooltip_controller_unittest.cc[diff]
• ash/wm/app_list_controller_unittest.cc[diff]
• ash/wm/dock/docked_window_resizer_unittest.cc[diff]
• ash/wm/gestures/overview_gesture_handler_unittest.cc[diff]
• ash/wm/immersive_fullscreen_controller_unittest.cc[diff]
• ash/wm/lock_state_controller_unittest.cc[diff]
• ash/wm/maximize_mode/maximize_mode_controller_unittest.cc[diff]
• ash/wm/maximize_mode/maximize_mode_window_manager_unittest.cc[diff]
• ash/wm/overview/window_selector_unittest.cc[diff]
• ash/wm/panels/panel_layout_manager_unittest.cc[diff]
• ash/wm/partial_screenshot_view_unittest.cc[diff]
• ash/wm/resize_shadow_and_cursor_unittest.cc[diff]
• ash/wm/system_gesture_event_filter_unittest.cc[diff]
• ash/wm/system_modal_container_layout_manager_unittest.cc[diff]
• ash/wm/toplevel_window_event_handler_unittest.cc[diff]
• ash/wm/window_manager_unittest.cc[diff]
• ash/wm/window_modality_controller_unittest.cc[diff]
• ash/wm/workspace/multi_window_resize_controller_unittest.cc[diff]
• ash/wm/workspace/workspace_event_handler_unittest.cc[diff]
• ash/wm/workspace/workspace_window_resizer_unittest.cc[diff]
• ash/wm/workspace_controller_unittest.cc[diff]
• athena/home/DEPS[diff]
• athena/home/home_card_unittest.cc[diff]
• athena/input/accelerator_manager_unittest.cc[diff]
• athena/screen/DEPS[diff]
• athena/screen/screen_manager_unittest.cc[diff]
• chrome/browser/chromeos/accessibility/touch_exploration_controller_browsertest.cc[diff]
• chrome/browser/ui/ash/launcher/chrome_launcher_controller_browsertest.cc[diff]
• chrome/browser/ui/views/ash/tab_scrubber_browsertest.cc[diff]
• chrome/browser/ui/views/omnibox/omnibox_view_views_browsertest.cc[diff]
• chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc[diff]
• chrome/browser/ui/window_sizer/window_sizer_ash_uitest.cc[diff]
• content/browser/renderer_host/render_widget_host_view_aura_unittest.cc[diff]
• content/browser/web_contents/aura/window_slider_unittest.cc[diff]
• content/browser/web_contents/touch_editable_impl_aura_browsertest.cc[diff]
• content/browser/web_contents/web_contents_view_aura_browsertest.cc[diff]
• ui/aura/BUILD.gn[diff]
• ui/aura/aura.gyp[diff]
• ui/aura/gestures/gesture_recognizer_unittest.cc[diff]
• ui/aura/test/event_generator_delegate_aura.cc[Renamed from ui/aura/test/event_generator.cc - diff]
• ui/aura/test/event_generator_delegate_aura.h[Renamed from ui/aura/test/event_generator.h - diff]
• ui/aura/window_event_dispatcher_unittest.cc[diff]
• ui/aura/window_unittest.cc[diff]
• ui/chromeos/touch_exploration_controller_unittest.cc[diff]
• ui/keyboard/keyboard_controller_unittest.cc[diff]
• ui/views/corewm/capture_controller_unittest.cc[diff]
• ui/views/corewm/desktop_capture_controller_unittest.cc[diff]
• ui/views/corewm/tooltip_controller_unittest.cc[diff]
• ui/views/touchui/touch_selection_controller_impl_unittest.cc[diff]
• ui/views/widget/desktop_aura/desktop_native_widget_aura_unittest.cc[diff]
• ui/views/widget/desktop_aura/desktop_screen_x11_unittest.cc[diff]
• ui/views/widget/widget_interactive_uitest.cc[diff]
• ui/wm/core/compound_event_filter_unittest.cc[diff]
• ui/wm/core/focus_controller_unittest.cc[diff]
• ui/wm/core/input_method_event_filter_unittest.cc[diff]