Mac QICRCodeFeature: forward declare in base/mac/sdk_forward_declarations.h

services/shape_detection/barcode_detection_impl_mac.h

 // Copyright 2017 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.
 
 #ifndef SERVICES_SHAPE_DETECTION_BARCODE_DETECTION_IMPL_MAC_H_
 #define SERVICES_SHAPE_DETECTION_BARCODE_DETECTION_IMPL_MAC_H_
 
-#import <QuartzCore/QuartzCore.h>
-
 #include "base/mac/scoped_nsobject.h"
 #include "services/shape_detection/public/interfaces/barcodedetection.mojom.h"
 
+@class CIDetector;
+
 namespace shape_detection {
 
 class BarcodeDetectionImplMac
     : public shape_detection::mojom::BarcodeDetection {
  public:
   BarcodeDetectionImplMac();
   ~BarcodeDetectionImplMac() override;
 
   void Detect(mojo::ScopedSharedBufferHandle frame_data,
               uint32_t width,
               uint32_t height,
               const shape_detection::mojom::BarcodeDetection::DetectCallback&
                   callback) override;
 
  private:
   base::scoped_nsobject<CIDetector> detector_;
 
   DISALLOW_COPY_AND_ASSIGN(BarcodeDetectionImplMac);
 };
 
 }  // namespace shape_detection
 
 #endif  // SERVICES_SHAPE_DETECTION_BARCODE_DETECTION_IMPL_MAC_H_