Remove legacy InfoBarViewProtocol.

ios/chrome/browser/native_app_launcher/native_app_infobar_controller.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/native_app_launcher/native_app_infobar_controller.h"
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ios/chrome/browser/native_app_launcher/native_app_infobar_delegate.h"
 #import "ios/chrome/browser/ui/infobars/infobar_view.h"
-#include "ios/chrome/browser/ui/infobars/infobar_view_protocol.h"
+#include "ios/chrome/browser/ui/infobars/infobar_view.h"
 #include "ios/chrome/grit/ios_strings.h"
 #import "ios/public/provider/chrome/browser/native_app_launcher/native_app_types.h"
 #include "ui/base/l10n/l10n_util.h"
 
 @interface NativeAppInfoBarController ()
 
 // Action for any of the user defined buttons.
 - (void)infoBarButtonDidPress:(UIButton*)button;
 
 // Notifies the delegate of which action the user took.
 - (void)userPerformedAction:(NativeAppActionType)userAction;
 
 // For testing.
 // Sets the infobar delegate.
 - (void)setInfoBarDelegate:(NativeAppInfoBarDelegate*)delegate;
 
 @end
 
 @implementation NativeAppInfoBarController {
   NativeAppInfoBarDelegate* nativeAppInfoBarDelegate_;  // weak
 }
 
 #pragma mark - InfoBarController
 
-- (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;
   nativeAppInfoBarDelegate_ = static_cast<NativeAppInfoBarDelegate*>(delegate);
   DCHECK(nativeAppInfoBarDelegate_);
   infoBarView.reset(
       [[InfoBarView alloc] initWithFrame:frame delegate:self.delegate]);
 
   // Lays out widgets common to all NativeAppInfobars.
   [infoBarView
       addPlaceholderTransparentIcon:native_app_infobar::kSmallIconSize];
   nativeAppInfoBarDelegate_->FetchSmallAppIcon(^(UIImage* image) {
     [infoBarView addLeftIconWithRoundedCornersAndShadow:image];
@@ skipping 67 matching lines @@
   nativeAppInfoBarDelegate_->UserPerformedAction(userAction);
 }
 
 #pragma mark - Testing
 
 - (void)setInfoBarDelegate:(NativeAppInfoBarDelegate*)delegate {
   nativeAppInfoBarDelegate_ = delegate;
 }
 
 @end