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

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

Index: ios/chrome/browser/ui/omnibox/truncating_attributed_label.h
diff --git a/ios/chrome/browser/ui/omnibox/truncating_attributed_label.h b/ios/chrome/browser/ui/omnibox/truncating_attributed_label.h
index d8fec99fc89e92566ddc2211a3186414cf9b4f30..ff46313626489a85dea70ebde3a9ba0915bf6ce9 100644
--- a/ios/chrome/browser/ui/omnibox/truncating_attributed_label.h
+++ b/ios/chrome/browser/ui/omnibox/truncating_attributed_label.h
@@ -32,13 +32,13 @@ typedef enum {
 @property(nonatomic, assign) NSTextAlignment textAlignment;
 
 // For display of an attributed string.
-@property(nonatomic, retain) NSMutableAttributedString* attributedText;
+@property(nonatomic, strong) NSMutableAttributedString* attributedText;
 
 // Set the label highlight state.
 @property(nonatomic, assign) BOOL highlighted;
 
 // Set the label highlight color.
-@property(nonatomic, retain) NSMutableAttributedString* highlightedText;
+@property(nonatomic, strong) NSMutableAttributedString* highlightedText;
 
 @end