Initialize CRIWVWebView with Configuration object instead of browserState.

ios/web_view/internal/criwv_browser_state.h

Index: ios/web_view/internal/criwv_browser_state.h
diff --git a/ios/web_view/internal/criwv_browser_state.h b/ios/web_view/internal/criwv_browser_state.h
index 636a200e9726bdcfeb8a2ee4a9e2f53f985457ca..9851667a90a9f88ac8bdf2fc4c9b69146b7b0798 100644
--- a/ios/web_view/internal/criwv_browser_state.h
+++ b/ios/web_view/internal/criwv_browser_state.h
@@ -24,7 +24,7 @@ class CRIWVURLRequestContextGetter;
 // CRIWV implementation of BrowserState.  Can only be called from the UI thread.
 class CRIWVBrowserState : public web::BrowserState {
  public:
-  CRIWVBrowserState();
+  explicit CRIWVBrowserState(bool off_the_record);
   ~CRIWVBrowserState() override;
 
   // web::BrowserState implementation.
@@ -45,6 +45,9 @@ class CRIWVBrowserState : public web::BrowserState {
   // The path associated with this BrowserState object.
   base::FilePath path_;
 
+  // Whether this BrowserState is incognito.
+  bool off_the_record_;
+
   // The request context getter for this BrowserState object.
   scoped_refptr<CRIWVURLRequestContextGetter> request_context_getter_;