ios: Stop using __weak.

ios/chrome/browser/translate/before_translate_infobar_controller.mm

Index: ios/chrome/browser/translate/before_translate_infobar_controller.mm
diff --git a/ios/chrome/browser/translate/before_translate_infobar_controller.mm b/ios/chrome/browser/translate/before_translate_infobar_controller.mm
index 7a872d9162f7a7ad9f9b244d28cf2fbbb0fefba9..c2588d2148ec328f1404ff18b785cb53641f31a4 100644
--- a/ios/chrome/browser/translate/before_translate_infobar_controller.mm
+++ b/ios/chrome/browser/translate/before_translate_infobar_controller.mm
@@ -31,7 +31,7 @@ NSTimeInterval kPickerAnimationDurationInSeconds = 0.2;
 // language list.
 @interface LanguagePickerController
     : UIViewController<UIPickerViewDataSource, UIPickerViewDelegate> {
-  __weak translate::TranslateInfoBarDelegate* _translateInfoBarDelegate;
+  translate::TranslateInfoBarDelegate* _translateInfoBarDelegate;  // weak
   NSInteger _initialRow;   // Displayed in bold font.
   NSInteger _disabledRow;  // Grayed out.
 }
@@ -107,7 +107,7 @@ NSTimeInterval kPickerAnimationDurationInSeconds = 0.2;
 @end
 
 @implementation BeforeTranslateInfoBarController {
-  __weak translate::TranslateInfoBarDelegate* _translateInfoBarDelegate;
+  translate::TranslateInfoBarDelegate* _translateInfoBarDelegate;  // weak
   // A fullscreen view that catches all touch events and contains a UIPickerView
   // and a UINavigationBar.
   base::scoped_nsobject<UIView> _languageSelectionView;