Remove CWV class and move setting User Agent to CWVWebViewConfiguration.

ios/web_view/internal/cwv_web_view.mm

 // 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/public/cwv_web_view.h"
 
 #include <memory>
 #include <utility>
 
 #import "base/ios/weak_nsobject.h"
@@ skipping 21 matching lines @@
 #import "net/base/mac/url_conversions.h"
 #include "ui/base/page_transition_types.h"
 #include "url/gurl.h"
 
 namespace {
 // A key used in NSCoder to store the session storage object.
 NSString* const kSessionStorageKey = @"sessionStorage";
 }
 
 @interface CWVWebView ()<CRWWebStateDelegate, CRWWebStateObserver> {
-  CWVWebViewConfiguration* _configuration;
   std::unique_ptr<web::WebState> _webState;
   std::unique_ptr<web::WebStateDelegateBridge> _webStateDelegate;
   std::unique_ptr<web::WebStateObserverBridge> _webStateObserver;
   std::unique_ptr<ios_web_view::WebViewWebStatePolicyDecider>
       _webStatePolicyDecider;
   double _estimatedProgress;
   // Handles presentation of JavaScript dialogs.
   std::unique_ptr<ios_web_view::WebViewJavaScriptDialogPresenter>
       _javaScriptDialogPresenter;
 }
 
+// Redefine the property as readwrite.
+@property(nonatomic, copy) CWVWebViewConfiguration* configuration;
 // Redefine the property as readwrite to define -setEstimatedProgress:, which
 // can be used to send KVO notification.
 @property(nonatomic, readwrite) double estimatedProgress;
 
 @end
 
+static NSString* gUserAgentProduct = nil;
+
 @implementation CWVWebView
 
 @synthesize configuration = _configuration;
 @synthesize navigationDelegate = _navigationDelegate;
 @synthesize translationDelegate = _translationDelegate;
 @synthesize estimatedProgress = _estimatedProgress;
 @synthesize UIDelegate = _UIDelegate;
 
++ (NSString*)userAgentProduct {
+  return gUserAgentProduct;
+}
+
++ (void)setUserAgentProduct:(NSString*)product {
+  gUserAgentProduct = [product copy];
+}
+
 - (instancetype)initWithFrame:(CGRect)frame
                 configuration:(CWVWebViewConfiguration*)configuration {
   self = [super initWithFrame:frame];
   if (self) {
     _configuration = [configuration copy];
     [self resetWebStateWithSessionStorage:nil];
   }
   return self;
 }
 
@@ skipping 227 matching lines @@
   if (subview.superview == self) {
     return;
   }
   subview.frame = self.bounds;
   subview.autoresizingMask =
       UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
   [self addSubview:subview];
 }
 
 @end