[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 9721629e1b4fec52e29d7d26c13425953a6dd389..f64a025fb0f7f3ec76d12508f74dcc578f3a1534 100644
--- a/ios/chrome/browser/ui/omnibox/omnibox_popup_material_row.h
+++ b/ios/chrome/browser/ui/omnibox/omnibox_popup_material_row.h
@@ -13,14 +13,14 @@
 @interface OmniboxPopupMaterialRow : UITableViewCell
 
 // A truncating version of the textLabel of a UITableViewCell.
-@property(nonatomic, readonly, retain)
+@property(nonatomic, readonly, strong)
     OmniboxPopupTruncatingLabel* textTruncatingLabel;
 // A truncating version of the detailTextLabel of a UITableViewCell.
-@property(nonatomic, readonly, retain)
+@property(nonatomic, readonly, strong)
     OmniboxPopupTruncatingLabel* detailTruncatingLabel;
-@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