Revert of AppListController refactoring part 2: Ash's AppListShowerDelegate imlementation.

Revert of AppListController refactoring part 2: Ash's AppListShowerDelegate imlementation. (patchset #8 id:160001 of https://codereview.chromium.org/1856943003/ )

Reason for revert:

The reason for reverting is: Suspected to be causing that Mac problem:
https://build.chromium.org/p/chromium/builders/Mac/builds/14169

Original issue's description:
> AppListController refactoring part 2: Ash's AppListShowerDelegate imlementation.
> 
> Part 1 of the refactoring: https://crrev.com/1830293002
> Design doc: https://docs.google.com/document/d/1M9vqTTuprMssRXs8UIVaFjQUq3lUxSzwrWoPjPvca6Q/edit?ts=56d0e9f0#heading=h.b2znwtuxd2x2
> 
> This CL adds ash::AppListShowerDelegate, which is the Ash implementation of
> app_list::AppListShowerDelegate. At this point it is unused - Ash is still using
> the old ash::AppListController class to control the app list.
> 
> BUG=557408
> 
> Committed: https://crrev.com/412803081c9d4f4321d267133512f45ce434fc10
> Cr-Commit-Position: refs/heads/master@{#386123}

TBR=sky@chromium.org,mgiuca@chromium.org,xiyuan@chromium.org,mfomitchev@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=557408

[beaudoin, 2016-04-08 20:12:19]

Created Revert of AppListController refactoring part 2: Ash's
AppListShowerDelegate imlementation.

[commit-bot: I haz the power, 2016-04-08 20:12:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1873903003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1873903003/1

[commit-bot: I haz the power, 2016-04-08 20:13:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-04-08 20:13:36]

Failed to apply patch for ash/ash.gyp:
While running git apply --index -3 -p1;
  error: patch failed: ash/ash.gyp:818
  Falling back to three-way merge...
  Applied patch to 'ash/ash.gyp' with conflicts.
  U ash/ash.gyp

Patch:       ash/ash.gyp
Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index
be76e386fc0abdbced92fd64287f93a2b74fa641..af7a2426f1dec515f11e7a56cd1d5163d4d13486
100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -28,11 +28,6 @@
       'accelerators/spoken_feedback_toggler.cc',
       'accelerators/spoken_feedback_toggler.h',
       'accessibility_delegate.h',
-      'app_list/app_list_shower_delegate.cc',
-      'app_list/app_list_shower_delegate.h',
-      'app_list/app_list_shower_delegate_factory.cc',
-      'app_list/app_list_shower_delegate_factory.h',
-      'app_list/app_list_view_delegate_factory.h',
       'ash_constants.cc',
       'ash_constants.h',
       'ash_export.h',
@@ -818,9 +813,6 @@
       'accelerators/accelerator_table_unittest.cc',
       'accelerators/magnifier_key_scroller_unittest.cc',
       'accelerators/spoken_feedback_toggler_unittest.cc',
-      # TODO(mfomitchev): uncomment when ash::Shell is switched to using
-      # app_list::AppListShower instead of ash::AppListController.
-#      'app_list/app_list_shower_delegate_unittest.cc',
       'ash_touch_exploration_manager_chromeos_unittest.cc',
       'autoclick/autoclick_unittest.cc',
       'content/display/screen_orientation_controller_chromeos_unittest.cc',
@@ -976,7 +968,6 @@
         '../third_party/icu/icu.gyp:icuuc',
         '../ui/accessibility/accessibility.gyp:accessibility',
         '../ui/app_list/app_list.gyp:app_list',
-        '../ui/app_list/shower/app_list_shower.gyp:app_list_shower',
         '../ui/aura/aura.gyp:aura',
         '../ui/base/ime/ui_base_ime.gyp:ui_base_ime',
         '../ui/base/ui_base.gyp:ui_base',
@@ -1111,7 +1102,6 @@
         '../testing/gtest.gyp:gtest',
         '../ui/accessibility/accessibility.gyp:ax_gen',
         '../ui/app_list/app_list.gyp:app_list_test_support',
-        '../ui/app_list/shower/app_list_shower.gyp:app_list_shower',
         '../ui/events/devices/events_devices.gyp:events_devices',
         '../ui/views/views.gyp:views_test_support',
         'ash',
@@ -1174,7 +1164,6 @@
         '../third_party/icu/icu.gyp:icuuc',
         '../ui/accessibility/accessibility.gyp:accessibility',
         '../ui/app_list/app_list.gyp:app_list',
-        '../ui/app_list/shower/app_list_shower.gyp:app_list_shower',
         '../ui/aura/aura.gyp:aura',
         '../ui/aura/aura.gyp:aura_test_support',
         '../ui/base/ime/ui_base_ime.gyp:ui_base_ime',
@@ -1274,7 +1263,6 @@
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../ui/app_list/app_list.gyp:app_list',
-        '../ui/app_list/shower/app_list_shower.gyp:app_list_shower',
         '../ui/aura/aura.gyp:aura',
         '../ui/base/ime/ui_base_ime.gyp:ui_base_ime',
         '../ui/base/ui_base.gyp:ui_base',