[ObjC ARC] Converts ios/chrome/browser/ui/omnibox:omnibox_internal to ARC.

ios/chrome/browser/ui/omnibox/omnibox_popup_material_row.h

Index: ios/chrome/browser/ui/omnibox/omnibox_popup_material_row.h
diff --git a/ios/chrome/browser/ui/omnibox/omnibox_popup_material_row.h b/ios/chrome/browser/ui/omnibox/omnibox_popup_material_row.h
index 48817cb021b427ef0539e0cc02912324c216756a..c0517453c9b0617770e404fb8182201259b9c31c 100644
--- a/ios/chrome/browser/ui/omnibox/omnibox_popup_material_row.h
+++ b/ios/chrome/browser/ui/omnibox/omnibox_popup_material_row.h
@@ -13,18 +13,18 @@
 @interface OmniboxPopupMaterialRow : UITableViewCell
 
 // A truncate-by-fading version of the textLabel of a UITableViewCell.
-@property(nonatomic, readonly, retain)
+@property(nonatomic, readonly, strong)
     OmniboxPopupTruncatingLabel* textTruncatingLabel;
 // A truncate-by-fading version of the detailTextLabel of a UITableViewCell.
-@property(nonatomic, readonly, retain)
+@property(nonatomic, readonly, strong)
     OmniboxPopupTruncatingLabel* detailTruncatingLabel;
 // A standard UILabel for answers, which truncates with ellipses to support
 // multi-line text.
-@property(nonatomic, readonly, retain) UILabel* detailAnswerLabel;
+@property(nonatomic, readonly, strong) UILabel* detailAnswerLabel;
 
-@property(nonatomic, readonly, retain) UIImageView* imageView;
-@property(nonatomic, readonly, retain) UIImageView* answerImageView;
-@property(nonatomic, readonly, retain) UIButton* appendButton;
+@property(nonatomic, readonly, strong) UIImageView* imageView;
+@property(nonatomic, readonly, strong) UIImageView* answerImageView;
+@property(nonatomic, readonly, strong) UIButton* appendButton;
 @property(nonatomic, assign) CGFloat rowHeight;
 
 // Initialize the row with the given incognito state. The colors and styling are