Remove CWV class and move setting User Agent to CWVWebViewConfiguration.

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 <ChromeWebView/ChromeWebView.h>
 #import <MobileCoreServices/MobileCoreServices.h>
 
 #import "ios/web_view/shell/translate_controller.h"
@@ skipping 115 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 = [CWV webViewWithFrame:[_containerView bounds]];
+  CWVWebViewConfiguration* configuration =
+      [CWVWebViewConfiguration defaultConfiguration];
+  self.webView = [[CWVWebView alloc] initWithFrame:[_containerView bounds]
+                                     configuration:configuration];
   _webView.navigationDelegate = self;
   _webView.UIDelegate = self;
   _translateController = [[TranslateController alloc] init];
   _webView.translationDelegate = _translateController;
 
   [_webView setAutoresizingMask:UIViewAutoresizingFlexibleWidth |
                                 UIViewAutoresizingFlexibleHeight];
   [_containerView addSubview:_webView];
 
   NSURLRequest* request = [NSURLRequest
@@ skipping 196 matching lines @@
   // TODO(crbug.com/679895): Add some visual indication that the page load has
   // finished.
   [self updateToolbar];
 }
 
 - (void)webViewWebContentProcessDidTerminate:(CWVWebView*)webView {
   NSLog(@"webViewWebContentProcessDidTerminate");
 }
 
 @end