Remove the iOS QR Code scanner experiment code.

ios/chrome/app/application_delegate/user_activity_handler_unittest.mm

 // Copyright 2016 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.
 
 #include "ios/chrome/app/application_delegate/user_activity_handler.h"
 
 #include <memory>
 
 #import <CoreSpotlight/CoreSpotlight.h>
 
@@ skipping 398 matching lines @@
     @[
       base::SysUTF8ToNSString(spotlight::kSpotlightActionVoiceSearch), @NO,
       @YES, @NO
     ],
     @[
       base::SysUTF8ToNSString(spotlight::kSpotlightActionQRScanner), @NO, @NO,
       @YES
     ]
   ];
 
-  // Enable the QR Scanner and Spotlight Actions experiments.
+  // Enable the Spotlight Actions experiment.
   base::test::ScopedCommandLine scoped_command_line;
   scoped_command_line.GetProcessCommandLine()->AppendSwitch(
-      switches::kEnableQRScanner);
-  scoped_command_line.GetProcessCommandLine()->AppendSwitch(
       switches::kEnableSpotlightActions);
 
   for (id parameters in parametersToTest) {
     base::scoped_nsobject<NSUserActivity> userActivity([[NSUserActivity alloc]
         initWithActivityType:CSSearchableItemActionType]);
     NSString* action = [NSString
         stringWithFormat:@"%@.%@", spotlight::StringFromSpotlightDomain(
                                        spotlight::DOMAIN_ACTIONS),
                          parameters[0]];
     NSDictionary* userInfo = @{CSSearchableItemActivityIdentifier : action};
@@ skipping 109 matching lines @@
   base::scoped_nsobject<FakeStartupInformation> fakeStartupInformation(
       [[FakeStartupInformation alloc] init]);
   [fakeStartupInformation setIsPresentingFirstRunUI:NO];
 
   NSArray* parametersToTest = @[
     @[ @"OpenNewTab", @NO, @NO, @NO ], @[ @"OpenIncognitoTab", @YES, @NO, @NO ],
     @[ @"OpenVoiceSearch", @NO, @YES, @NO ],
     @[ @"OpenQRScanner", @NO, @NO, @YES ]
   ];
 
-  // Enable the QR Scanner experiment.
-  base::test::ScopedCommandLine scoped_command_line;
-  scoped_command_line.GetProcessCommandLine()->AppendSwitch(
-      switches::kEnableQRScanner);
-
   swizzleHandleStartupParameters();
 
   for (id parameters in parametersToTest) {
     base::scoped_nsobject<UIApplicationShortcutItem> shortcut(
         [[UIApplicationShortcutItem alloc] initWithType:parameters[0]
                                          localizedTitle:parameters[0]]);
 
     resetHandleStartupParametersHasBeenCalled();
 
     // The test will fail is a method of those objects is called.
@@ skipping 48 matching lines @@
                                   completionHandler:getCompletionHandler()
                                           tabOpener:tabOpenerMock
                                  startupInformation:startupInformationMock
                              browserViewInformation:browserViewInformationMock];
 
   // Tests.
   EXPECT_TRUE(completionHandlerExecuted());
   EXPECT_FALSE(completionHandlerArgument());
   EXPECT_FALSE(getHandleStartupParametersHasBeenCalled());
 }