[multiball] Remove sceneController property.

This property was used before there was an "official" way
to access scene controllers. Now it can be fetched through
the app state.

Change-Id: I11abb2508323000b2ed317f9ad2de12f748510d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299631Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788695}

ios/chrome/app/main_application_delegate.mm

@@ -87,7 +87,6 @@
       // TODO(crbug.com/1040501): remove this.
       // This is temporary plumbing that's not supposed to be here.
       _sceneController.mainController = (id<MainControllerGuts>)_mainController;
-      _mainController.sceneController = _sceneController;
       _tabSwitcherProtocol = _sceneController;
       _tabOpener = _sceneController;
     }

ios/chrome/app/main_controller.h

@@ -11,16 +11,11 @@
 #import "ios/chrome/app/application_delegate/browser_launcher.h"
 #import "ios/chrome/app/application_delegate/startup_information.h"
 #import "ios/chrome/app/main_controller_guts.h"
-#import "ios/chrome/browser/ui/commands/application_commands.h"
 #import "ios/chrome/browser/ui/commands/browsing_data_commands.h"
 
 @class AppState;
 @class MetricsMediator;
 @protocol BrowsingDataCommands;
-@protocol ConnectionInformation;
-@protocol SceneControllerGuts;
-@protocol TabOpening;
-@protocol TabSwitcherDelegate;
 
 // The main controller of the application, owned by the MainWindow nib. Also
 // serves as the delegate for the app. Owns all the various top-level
@@ -45,14 +40,6 @@
 // to the user preferences.
 @property(nonatomic, weak) MetricsMediator* metricsMediator;
 
-// For temporary plumbing only.
-@property(nonatomic, weak) id<ApplicationCommands,
-                              TabSwitcherDelegate,
-                              ConnectionInformation,
-                              SceneControllerGuts,
-                              TabOpening>
-    sceneController;
-
 @end
 
 #endif  // IOS_CHROME_APP_MAIN_CONTROLLER_H_

ios/chrome/app/main_controller.mm

@@ -587,8 +587,9 @@ void MainControllerAuthenticationServiceDelegate::ClearBrowsingData(
     }
   }
 
-  [self.sceneController startUpChromeUIPostCrash:postCrashLaunch
-                                 needRestoration:needRestore];
+  SceneState* sceneState = self.appState.connectedScenes.firstObject;
+  [sceneState.controller startUpChromeUIPostCrash:postCrashLaunch
+                                  needRestoration:needRestore];
   [self startUpAfterFirstWindowCreated];
 }
 
@@ -649,7 +650,6 @@ void MainControllerAuthenticationServiceDelegate::ClearBrowsingData(
         base::mac::ObjCCastStrict<UIWindowScene>(notification.object);
     SceneDelegate* sceneDelegate =
         base::mac::ObjCCastStrict<SceneDelegate>(scene.delegate);
-    self.sceneController = sceneDelegate.sceneController;
     sceneDelegate.sceneController.mainController = self;
   }
 }
@@ -1292,7 +1292,8 @@ void MainControllerAuthenticationServiceDelegate::ClearBrowsingData(
 - (void)setStartupParametersWithURL:(const GURL&)launchURL {
   DCHECK(!IsSceneStartupSupported());
   NSString* sourceApplication = @"Fake App";
-  self.sceneController.startupParameters = [ChromeAppStartupParameters
+  SceneState* sceneState = self.appState.foregroundActiveScene;
+  sceneState.controller.startupParameters = [ChromeAppStartupParameters
       newChromeAppStartupParametersWithURL:net::NSURLWithGURL(launchURL)
                      fromSourceApplication:sourceApplication];
 }