Revert of ChromeWebView integration test for Incognito.

ios/web_view/test/web_view_test_util.h

Index: ios/web_view/test/web_view_test_util.h
diff --git a/ios/web_view/test/web_view_test_util.h b/ios/web_view/test/web_view_test_util.h
index daa812598bf16f7c5c8c180cb619014f97693f1c..fbf604bf12992e18faf09f83f37ecdba2d59d86b 100644
--- a/ios/web_view/test/web_view_test_util.h
+++ b/ios/web_view/test/web_view_test_util.h
@@ -10,14 +10,9 @@
 #include "base/compiler_specific.h"
 
 @class CWVWebView;
-@class CWVWebViewConfiguration;
 
 namespace ios_web_view {
 namespace test {
-
-// Creates web view with given |configuration| and frame equal to screen bounds.
-CWVWebView* CreateWebView(CWVWebViewConfiguration* configuration)
-    WARN_UNUSED_RESULT;
 
 // Creates web view with default configuration and frame equal to screen bounds.
 CWVWebView* CreateWebView() WARN_UNUSED_RESULT;