Remove legacy InfoBarViewProtocol.

ios/chrome/browser/translate/after_translate_infobar_controller.mm

Index: ios/chrome/browser/translate/after_translate_infobar_controller.mm
diff --git a/ios/chrome/browser/translate/after_translate_infobar_controller.mm b/ios/chrome/browser/translate/after_translate_infobar_controller.mm
index e7740b98e604228045b237cbf85583b9f2250a3c..36d1a4e7a1bdc4c9c3958dc067e9ef68a95616ab 100644
--- a/ios/chrome/browser/translate/after_translate_infobar_controller.mm
+++ b/ios/chrome/browser/translate/after_translate_infobar_controller.mm
@@ -12,7 +12,6 @@
 #include "ios/chrome/browser/translate/translate_infobar_tags.h"
 #import "ios/chrome/browser/ui/infobars/infobar_view.h"
 #import "ios/chrome/browser/ui/infobars/infobar_view_delegate.h"
-#import "ios/chrome/browser/ui/infobars/infobar_view_protocol.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/image/image.h"
 
@@ -30,10 +29,9 @@
 #pragma mark -
 #pragma mark InfoBarControllerProtocol
 
-- (UIView<InfoBarViewProtocol>*)viewForDelegate:
-                                    (infobars::InfoBarDelegate*)delegate
-                                          frame:(CGRect)frame {
-  base::scoped_nsobject<UIView<InfoBarViewProtocol>> infoBarView;
+- (InfoBarView*)viewForDelegate:(infobars::InfoBarDelegate*)delegate
+                          frame:(CGRect)frame {
+  base::scoped_nsobject<InfoBarView> infoBarView;
   _translateInfoBarDelegate = delegate->AsTranslateInfoBarDelegate();
   DCHECK(_translateInfoBarDelegate);
   infoBarView.reset(