[iOS] Stop swizzling the |init| method of CameraController.

ios/chrome/browser/ui/qr_scanner/camera_controller.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.
 
 #import "ios/chrome/browser/ui/qr_scanner/camera_controller.h"
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "base/strings/stringprintf.h"
 #include "ios/chrome/common/ios_app_bundle_id_prefix.h"
@@ skipping 16 matching lines @@
 
 // The current state of the camera. The state is set to CAMERA_NOT_LOADED before
 // the camera is first loaded, and afterwards it is never CAMERA_NOT_LOADED.
 @property(nonatomic, readwrite, assign) qr_scanner::CameraState cameraState;
 // Redeclaration of |torchActive| to make the setter private.
 @property(nonatomic, readwrite, assign, getter=isTorchActive) BOOL torchActive;
 // The current availability of the torch.
 @property(nonatomic, readwrite, assign, getter=isTorchAvailable)
     BOOL torchAvailable;
 
+// Initializes the controller with the |delegate|.
+- (instancetype)initWithDelegate:(id<CameraControllerDelegate>)delegate
+    NS_DESIGNATED_INITIALIZER;
+
 // YES if |cameraState| is CAMERA_AVAILABLE.
 - (BOOL)isCameraAvailable;
 // Starts receiving notfications about changes to the capture session and to the
 // torch properties.
 - (void)startReceivingNotifications;
 // Stops receiving all notifications.
 - (void)stopReceivingNotifications;
 // Returns the camera attached to |_captureSession|.
 - (AVCaptureDevice*)getCamera;
 // Returns the AVCaptureVideoOrientation to compensate for the current
 // UIInterfaceOrientation. Defaults to AVCaptureVideoOrientationPortrait.
 - (AVCaptureVideoOrientation)videoOrientationForCurrentInterfaceOrientation;
 
 @end
 
 @implementation CameraController {
   qr_scanner::CameraState _cameraState;
   BOOL _torchActive;
   BOOL _torchAvailable;
   CGRect _viewportRect;
 }
 
 #pragma mark lifecycle
 
++ (instancetype)cameraControllerWithDelegate:
+    (id<CameraControllerDelegate>)delegate {
+  CameraController* cameraController =
+      [[CameraController alloc] initWithDelegate:delegate];
+  return cameraController;
+}
+
 - (instancetype)initWithDelegate:(id<CameraControllerDelegate>)delegate {
   self = [super init];
   if (self) {
     DCHECK(delegate);
     _cameraState = qr_scanner::CAMERA_NOT_LOADED;
     _delegate = delegate;
     std::string queueName =
         base::StringPrintf("%s.chrome.ios.QRScannerCaptureSessionQueue",
                            BUILDFLAG(IOS_APP_BUNDLE_ID_PREFIX));
     _sessionQueue =
@@ skipping 381 matching lines @@
       [resultType isEqualToString:AVMetadataObjectTypeEAN13Code] ||
       [resultType isEqualToString:AVMetadataObjectTypeInterleaved2of5Code] ||
       [resultType isEqualToString:AVMetadataObjectTypeITF14Code];
 
   // Note: |captureOutput| is called on the main queue. This is specified by
   // |setMetadataObjectsDelegate:queue:|.
   [_delegate receiveQRScannerResult:resultString loadImmediately:isAllDigits];
 }
 
 @end