| Index: ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.mm
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| diff --git a/ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.mm b/ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.mm
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| index 63d2a1be2d04f6870ee3b9517bce2c550a3d4c47..006dcae7fb13173a0f0cbd833d39f45fa876c643 100644
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| --- a/ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.mm
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| +++ b/ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.mm
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| @@ -4,5 +4,9 @@
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|  
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|  #import "ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.h"
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|  
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| +#if !defined(__has_feature) || !__has_feature(objc_arc)
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| +#error "This file requires ARC support."
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| +#endif
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| +
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|  const int kNewTabPageShadowHeight = 2;
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|  const int kNewTabPageDistanceToFadeShadow = 20;
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| 
 |