Revert "[ios] Add ScreenTime overlay modality"

This reverts commit e413add4.

Reason for revert: This approach is wrong. A much simpler approach is now being implemented in 
https://chromium-review.googlesource.com/c/chromium/src/+/2391798

Original change's description:
> [ios] Add ScreenTime overlay modality
> 
> This is one of a series of CLs to implement ScreenTime.
> 
> This CL:
> * Adds a new overlay modality above the web content area for the
> ScreenTime blocking view overlay
> * Adds and integrates no-op supported overlay coordinator classes.
> 
> Bug: 1123704
> Change-Id: Idee3417df9dee7cd15b8fcc93e4ee6944a5e530e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386535
> Reviewed-by: Chris Lu <thegreenfrog@chromium.org>
> Commit-Queue: edchin <edchin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#803274}

TBR=michaeldo@chromium.org,edchin@chromium.org,thegreenfrog@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1123704
Change-Id: If19b96825b7788cbdaa77b8e505278d049807814
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390839Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804470}

ios/chrome/browser/overlays/public/overlay_modality.h

@@ -14,9 +14,6 @@ enum class OverlayModality {
   // Used to schedule overlay UI to be displayed modally over a WebState's
   // content area (i.e. present UI requested by script execution on a page).
   kWebContentArea,
-  // Used to schedule overlay UI to be displayed modally over a WebState's
-  // content area, above all other overlays in the web content area.
-  kScreenTime,
   // Used to schedule overlay UI to display Infobar banners.  This modality is
   // in front of the Browser view, allowing the banner to be displayed over the
   // toolbar.

ios/chrome/browser/ui/overlays/BUILD.gn

@@ -42,7 +42,6 @@ source_set("overlays") {
     "//ios/chrome/browser/ui/fullscreen:feature_flags",
     "//ios/chrome/browser/ui/overlays/infobar_banner",
     "//ios/chrome/browser/ui/overlays/infobar_modal",
-    "//ios/chrome/browser/ui/overlays/screen_time",
     "//ios/chrome/browser/ui/overlays/web_content_area",
     "//ios/chrome/common/ui/util",
   ]

ios/chrome/browser/ui/overlays/overlay_coordinator_factory.mm

@@ -11,7 +11,6 @@
 #import "ios/chrome/browser/ui/overlays/infobar_modal/infobar_modal_supported_overlay_coordinator_classes.h"
 #import "ios/chrome/browser/ui/overlays/overlay_coordinator_factory+initialization.h"
 #import "ios/chrome/browser/ui/overlays/overlay_request_coordinator.h"
-#import "ios/chrome/browser/ui/overlays/screen_time/screen_time_supported_overlay_coordinator_classes.h"
 #import "ios/chrome/browser/ui/overlays/web_content_area/web_content_area_supported_overlay_coordinator_classes.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -45,10 +44,6 @@
       supportedCoordinatorClasses =
           web_content_area::GetSupportedOverlayCoordinatorClasses();
       break;
-    case OverlayModality::kScreenTime:
-      supportedCoordinatorClasses =
-          screen_time::GetSupportedOverlayCoordinatorClasses();
-      break;
     case OverlayModality::kInfobarBanner:
       supportedCoordinatorClasses =
           infobar_banner::GetSupportedOverlayCoordinatorClasses();

ios/chrome/browser/ui/overlays/screen_time/BUILD.gn

-# Copyright 2020 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-source_set("screen_time") {
-  public = [ "screen_time_supported_overlay_coordinator_classes.h" ]
-  sources = [ "screen_time_supported_overlay_coordinator_classes.mm" ]
-
-  configs += [ "//build/config/compiler:enable_arc" ]
-
-  deps = []
-}

ios/chrome/browser/ui/overlays/screen_time/OWNERS

-edchin@chromium.org
-
-# TEAM: ios-directory-owners@chromium.org
-# OS: iOS
\ No newline at end of file

ios/chrome/browser/ui/overlays/screen_time/screen_time_supported_overlay_coordinator_classes.h

-// Copyright 2020 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef IOS_CHROME_BROWSER_UI_OVERLAYS_SCREEN_TIME_SCREEN_TIME_SUPPORTED_OVERLAY_COORDINATOR_CLASSES_H_
-#define IOS_CHROME_BROWSER_UI_OVERLAYS_SCREEN_TIME_SCREEN_TIME_SUPPORTED_OVERLAY_COORDINATOR_CLASSES_H_
-
-#import <Foundation/Foundation.h>
-
-namespace screen_time {
-
-// Returns the supported OverlayRequestCoordinator classes for
-// OverlayModality::kScreenTime.
-NSArray<Class>* GetSupportedOverlayCoordinatorClasses();
-
-}  // screen_time
-
-#endif  // IOS_CHROME_BROWSER_UI_OVERLAYS_SCREEN_TIME_SCREEN_TIME_SUPPORTED_OVERLAY_COORDINATOR_CLASSES_H_

ios/chrome/browser/ui/overlays/screen_time/screen_time_supported_overlay_coordinator_classes.mm

-// Copyright 2020 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#import "ios/chrome/browser/ui/overlays/screen_time/screen_time_supported_overlay_coordinator_classes.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace screen_time {
-
-NSArray<Class>* GetSupportedOverlayCoordinatorClasses() {
-  // TODO(crbug.com/1123696): Create ScreenTime coordinator.
-  return @[];
-}
-
-}  // screen_time