Remove CWV class and move setting User Agent to CWVWebViewConfiguration.

ios/web_view/internal/cwv_web_view.mm

Index: ios/web_view/internal/cwv_web_view.mm
diff --git a/ios/web_view/internal/cwv_web_view.mm b/ios/web_view/internal/cwv_web_view.mm
index 08fb4d8dc30b2994005f51fbd5799b2b1efbc42c..fdb5f9520a2376ef05a7a67136543128e229f686 100644
--- a/ios/web_view/internal/cwv_web_view.mm
+++ b/ios/web_view/internal/cwv_web_view.mm
@@ -34,7 +34,6 @@
 #include "url/gurl.h"
 
 @interface CWVWebView ()<CRWWebStateDelegate, CRWWebStateObserver> {
-  CWVWebViewConfiguration* _configuration;
   std::unique_ptr<web::WebState> _webState;
   std::unique_ptr<web::WebStateDelegateBridge> _webStateDelegate;
   std::unique_ptr<web::WebStateObserverBridge> _webStateObserver;
@@ -46,12 +45,16 @@
       _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;
@@ -60,6 +63,14 @@
 @synthesize estimatedProgress = _estimatedProgress;
 @synthesize UIDelegate = _UIDelegate;
 
++ (NSString*)userAgentProduct {
+  return gUserAgentProduct;
+}
+
++ (void)setUserAgentProduct:(NSString*)product {
+  gUserAgentProduct = product;

[Eugene But (OOO till 7-30), 2017/04/12 00:46:17]

gUserAgentProduct = [product copy];

[michaeldo, 2017/04/12 17:16:48]

Done.

+}
+
 - (instancetype)initWithFrame:(CGRect)frame
                 configuration:(CWVWebViewConfiguration*)configuration {
   self = [super initWithFrame:frame];
@@ -67,7 +78,7 @@
     _configuration = [configuration copy];
 
     web::WebState::CreateParams webStateCreateParams(
-        configuration.browserState);
+        _configuration.browserState);
     _webState = web::WebState::Create(webStateCreateParams);
     _webState->SetWebUsageEnabled(true);