Remove the iOS QR Code scanner experiment code.

ios/chrome/app/main_controller.mm

Index: ios/chrome/app/main_controller.mm
diff --git a/ios/chrome/app/main_controller.mm b/ios/chrome/app/main_controller.mm
index abf595ef627581063b8bf2d1c3e5187c8f51f832..78a883732ce5937099987b205848482c9a07f587 100644
--- a/ios/chrome/app/main_controller.mm
+++ b/ios/chrome/app/main_controller.mm
@@ -946,8 +946,7 @@ enum class StackViewDismissalMode { NONE, NORMAL, INCOGNITO };
 }
 
 - (BOOL)startQRScannerAfterTabSwitcherDismissal {
-  return (experimental_flags::IsQRCodeReaderEnabled() &&
-          _startQRScannerAfterTabSwitcherDismissal);
+  return _startQRScannerAfterTabSwitcherDismissal;
 }
 
 - (void)setStartQRScannerAfterTabSwitcherDismissal:(BOOL)startQRScanner {
@@ -1212,7 +1211,6 @@ enum class StackViewDismissalMode { NONE, NORMAL, INCOGNITO };
   [self scheduleDeleteDownloadsDirectory];
   [self scheduleStartupAttemptReset];
   [self scheduleFreeMemoryMonitoring];
-  [self scheduleAddApplicationShortcutItems];
   [self scheduleAppDistributionPings];
   [self scheduleCheckNativeApps];
 }
@@ -1244,34 +1242,6 @@ enum class StackViewDismissalMode { NONE, NORMAL, INCOGNITO };
                   block:block];
 }
 
-- (void)scheduleAddApplicationShortcutItems {
-  ProceduralBlock block = ^{
-    if (experimental_flags::IsQRCodeReaderEnabled()) {
-      UIApplicationShortcutItem* qrScannerShortcutItem = [[
-          [UIApplicationShortcutItem alloc]
-               initWithType:@"OpenQRScanner"
-             localizedTitle:l10n_util::GetNSString(
-                                IDS_IOS_APPLICATION_SHORTCUT_QR_SCANNER_TITLE)
-          localizedSubtitle:nil
-                       icon:[UIApplicationShortcutIcon
-                                iconWithTemplateImageName:
-                                    @"quick_action_qr_scanner"]
-                   userInfo:nil] autorelease];
-      // Note: The following only affects dynamic shortcut items defined
-      // programmatically, and not static shortcut items set in the Info.plist
-      // file.
-      [[UIApplication sharedApplication]
-          setShortcutItems:@[ qrScannerShortcutItem ]];
-    } else {
-      [[UIApplication sharedApplication] setShortcutItems:nil];
-    }
-  };
-
-  [[DeferredInitializationRunner sharedInstance]
-      enqueueBlockNamed:kAddApplicationShortcutItems
-                  block:block];
-}
-
 - (void)expireFirstUserActionRecorder {
   // Clear out any scheduled calls to this method. For example, the app may have
   // been backgrounded before the |kFirstUserActionTimeout| expired.