Fix QR scanner viewport

A change, cropping the QR Scanner preview layer was uploaded by mistake in CL: https://chromium-review.googlesource.com/c/chromium/src/+/1730906

This CL reverts this change.

Bug:996638

Change-Id: I4a9c462aa4fe6de81951dbf3473ac663b2e5cde1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758240
Commit-Queue: Tanisha Mandre <tanishamandre@google.com>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689406}

ios/chrome/browser/ui/scanner/camera_controller.mm

@@ -109,7 +109,7 @@
     }
     strongSelf.viewportRect = viewportRect;
     if (strongSelf.metadataOutput) {
-      //[strongSelf.metadataOutput setRectOfInterest:_viewportRect];
+      [strongSelf.metadataOutput setRectOfInterest:_viewportRect];
     }
   });
 }

ios/chrome/browser/ui/scanner/scanner_view_controller.mm

@@ -80,10 +80,6 @@ using base::UserMetricsAction;
   ]];
 
   AVCaptureVideoPreviewLayer* previewLayer = [self.scannerView getPreviewLayer];
-  //  CGRect rect = [self.scannerView frame];
-  // NSLog(@"%@", NSStringFromCGRect(rect));
-  previewLayer.frame = CGRectMakeCenteredRectInFrame(
-      [self.scannerView frame].size, [self.scannerView viewportSize]);
 
   switch ([self.cameraController getAuthorizationStatus]) {
     case AVAuthorizationStatusNotDetermined:

ios/chrome/browser/ui/scanner/video_preview_view.mm

@@ -39,7 +39,7 @@
 }
 
 - (CGRect)viewportRectOfInterest {
-  // DCHECK(CGPointEqualToPoint(self.frame.origin, CGPointZero));
+  DCHECK(CGPointEqualToPoint(self.frame.origin, CGPointZero));
   CGRect viewportRect =
       CGRectMakeCenteredRectInFrame(self.frame.size, _viewportSize);
   AVCaptureVideoPreviewLayer* layer = [self previewLayer];