Let CRIWVWebView inherit UIView instead of NSObject.

ios/web_view/shell/shell_view_controller.m

 // Copyright 2014 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/web_view/shell/shell_view_controller.h"
 
 #import "ios/web_view/public/criwv.h"
 #import "ios/web_view/public/criwv_web_view.h"
 #import "ios/web_view/shell/translate_controller.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @interface ShellViewController ()
 // Container for |webView|.
 @property(nonatomic, strong) UIView* containerView;
 // Text field used for navigating to URLs.
 @property(nonatomic, strong) UITextField* field;
 // Toolbar containing navigation buttons and |field|.
 @property(nonatomic, strong) UIToolbar* toolbar;
 // CRIWV view which renders the web page.
-@property(nonatomic, strong) id<CRIWVWebView> webView;
+@property(nonatomic, strong) CRIWVWebView* webView;
 // Handles the translation of the content displayed in |webView|.
 @property(nonatomic, strong) TranslateController* translateController;
 
 - (void)back;
 - (void)forward;
 - (void)stopLoading;
 @end
 
 @implementation ShellViewController
 
@@ skipping 79 matching lines @@
   [stop setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
   [stop addTarget:self
                 action:@selector(stopLoading)
       forControlEvents:UIControlEventTouchUpInside];
 
   [_toolbar addSubview:back];
   [_toolbar addSubview:forward];
   [_toolbar addSubview:stop];
   [_toolbar addSubview:_field];
 
-  self.webView = [CRIWV webView];
+  self.webView = [CRIWV webViewWithFrame:[_containerView bounds]];
   [_webView setDelegate:self];
-  UIView* view = [_webView view];
-  [_containerView addSubview:view];
-  [view setFrame:[_containerView bounds]];
-  [view setAutoresizingMask:UIViewAutoresizingFlexibleWidth |
-                            UIViewAutoresizingFlexibleHeight];
+  [_webView setAutoresizingMask:UIViewAutoresizingFlexibleWidth |
+                                UIViewAutoresizingFlexibleHeight];
+  [_containerView addSubview:_webView];
 
   [_webView loadURL:[NSURL URLWithString:@"https://www.google.com/"]];
 }
 
 - (UIBarPosition)positionForBar:(id<UIBarPositioning>)bar {
   if (bar == _toolbar) {
     return UIBarPositionTopAttached;
   }
   return UIBarPositionAny;
 }
@@ skipping 25 matching lines @@
   // Do not update the URL if the text field is currently being edited.
   if ([_field isFirstResponder]) {
     return;
   }
 
   [_field setText:[[_webView visibleURL] absoluteString]];
 }
 
 #pragma mark CRIWVWebViewDelegate methods
 
-- (void)webView:(id<CRIWVWebView>)webView
+- (void)webView:(CRIWVWebView*)webView
     didFinishLoadingWithURL:(NSURL*)url
                 loadSuccess:(BOOL)loadSuccess {
   // TODO(crbug.com/679895): Add some visual indication that the page load has
   // finished.
   [self updateToolbar];
 }
 
-- (void)webView:(id<CRIWVWebView>)webView
+- (void)webView:(CRIWVWebView*)webView
     didUpdateWithChanges:(CRIWVWebViewUpdateType)changes {
   if (changes & CRIWVWebViewUpdateTypeProgress) {
     // TODO(crbug.com/679895): Add a progress indicator.
   }
 
   if (changes & CRIWVWebViewUpdateTypeTitle) {
     // TODO(crbug.com/679895): Add a title display.
   }
 
   if (changes & CRIWVWebViewUpdateTypeURL) {
     [self updateToolbar];
   }
 }
 
 - (id<CRIWVTranslateDelegate>)translateDelegate {
   if (!_translateController)
     self.translateController = [[TranslateController alloc] init];
   return _translateController;
 }
 
 @end