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

ios/chrome/browser/ui/find_bar/find_bar_view.h

Index: ios/chrome/browser/ui/find_bar/find_bar_view.h
diff --git a/ios/chrome/browser/ui/find_bar/find_bar_view.h b/ios/chrome/browser/ui/find_bar/find_bar_view.h
index 98332e3ffc605bf9adac2d53add6c18d0eb7f9a3..1382d40726fe3bc67d72aa3f4e05bd581c7da7fb 100644
--- a/ios/chrome/browser/ui/find_bar/find_bar_view.h
+++ b/ios/chrome/browser/ui/find_bar/find_bar_view.h
@@ -38,13 +38,13 @@ extern NSString* const kFindInPageCloseButtonId;
 - (void)updateResultsLabelWithText:(NSString*)text;
 
 // The textfield with search term.
-@property(nonatomic, assign) UITextField* inputField;
+@property(nonatomic, weak) UITextField* inputField;
 // Button to go to previous search result.
-@property(nonatomic, assign) UIButton* previousButton;
+@property(nonatomic, weak) UIButton* previousButton;
 // Button to go to next search result.
-@property(nonatomic, assign) UIButton* nextButton;
+@property(nonatomic, weak) UIButton* nextButton;
 // Button to dismiss Find in Page.
-@property(nonatomic, assign) UIButton* closeButton;
+@property(nonatomic, weak) UIButton* closeButton;
 
 @end