[ios] Remove unused code from download_manager_coordinator.mm

This is a follow up cleanup to crrev.com/c/1884550 where
didFailOpenInMenuPresentation method call was removed.

Bug: None
Change-Id: I15f5f6982776681139397adbf937b28d6caea56e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572781Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834328}

ios/chrome/browser/ui/download/download_manager_coordinator.mm

@@ -30,7 +30,6 @@
 #include "ios/chrome/browser/overlays/public/overlay_callback_manager.h"
 #import "ios/chrome/browser/overlays/public/overlay_request_queue.h"
 #import "ios/chrome/browser/store_kit/store_kit_coordinator.h"
-#import "ios/chrome/browser/ui/alert_coordinator/alert_coordinator.h"
 #import "ios/chrome/browser/ui/commands/browser_coordinator_commands.h"
 #import "ios/chrome/browser/ui/commands/command_dispatcher.h"
 #import "ios/chrome/browser/ui/download/activities/open_downloads_folder_activity.h"
@@ -173,10 +172,6 @@ class UnopenedDownloadsTracker : public web::DownloadTaskObserver,
   UIActivityViewController* _openInController;
   DownloadManagerMediator _mediator;
   StoreKitCoordinator* _storeKitCoordinator;
-  // Coordinator for displaying the alert informing the user that no application
-  // on the device can open the file. The alert offers the user to install
-  // Google Drive app.
-  AlertCoordinator* _installDriveAlertCoordinator;
   UnopenedDownloadsTracker _unopenedDownloads;
 }
 @end
@@ -229,8 +224,6 @@ class UnopenedDownloadsTracker : public web::DownloadTaskObserver,
 
   [_storeKitCoordinator stop];
   _storeKitCoordinator = nil;
-  [_installDriveAlertCoordinator stop];
-  _installDriveAlertCoordinator = nil;
 }
 
 - (UIViewController*)viewController {
@@ -417,38 +410,6 @@ class UnopenedDownloadsTracker : public web::DownloadTaskObserver,
       DownloadFileUIGoogleDrive::Count);
 }
 
-// Called when Open In... menu was not presented. This method shows the alert
-// which offers the user to install Google Drive app.
-- (void)didFailOpenInMenuPresentation {
-  NSString* title =
-      l10n_util::GetNSString(IDS_IOS_DOWNLOAD_MANAGER_UNABLE_TO_OPEN_FILE);
-  NSString* message =
-      l10n_util::GetNSString(IDS_IOS_DOWNLOAD_MANAGER_NO_APP_MESSAGE);
-
-  _installDriveAlertCoordinator = [[AlertCoordinator alloc]
-      initWithBaseViewController:self.baseViewController
-                         browser:self.browser
-                           title:title
-                         message:message];
-
-  NSString* googleDriveButtonTitle =
-      l10n_util::GetNSString(IDS_IOS_DOWNLOAD_MANAGER_UPLOAD_TO_GOOGLE_DRIVE);
-  __weak DownloadManagerCoordinator* weakSelf = self;
-  [_installDriveAlertCoordinator
-      addItemWithTitle:googleDriveButtonTitle
-                action:^{
-                  [weakSelf presentStoreKitForGoogleDriveApp];
-                }
-                 style:UIAlertActionStyleDefault];
-
-  [_installDriveAlertCoordinator
-      addItemWithTitle:l10n_util::GetNSString(IDS_CANCEL)
-                action:nil
-                 style:UIAlertActionStyleCancel];
-
-  [_installDriveAlertCoordinator start];
-}
-
 // Presents StoreKit dialog for Google Drive application.
 - (void)presentStoreKitForGoogleDriveApp {
   if (!_storeKitCoordinator) {