Provide an overload to WebView::create that does not require a WebViewClient.

third_party/WebKit/public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 101 matching lines @@
   using WebWidget::didAcquirePointerLock;
   using WebWidget::didNotAcquirePointerLock;
   using WebWidget::didLosePointerLock;
   using WebWidget::backgroundColor;
   using WebWidget::pagePopup;
   using WebWidget::updateBrowserControlsState;
 
   // Initialization ------------------------------------------------------
 
   // Creates a WebView that is NOT yet initialized. You will need to
-  // call setMainFrame to finish the initialization. It is valid
-  // to pass a null client pointer. The WebPageVisibilityState defines the
-  // initial visibility of the page.
+  // call setMainFrame to finish the initialization. Use this factory method
+  // if you do not want to specify a client for callback notifications. The
+  // WebPageVisibilityState defines the initial visibility of the page.
+  BLINK_EXPORT static WebView* create(WebPageVisibilityState);
+
+  // Creates a WebView that is NOT yet initialized. You will need to
+  // call setMainFrame to finish the initialization. A valid WebViewClient must
+  // be supplied. The WebPageVisibilityState defines the initial visibility of
+  // the page.
   BLINK_EXPORT static WebView* create(WebViewClient*, WebPageVisibilityState);
 
   // After creating a WebView, you should immediately call this method.
   // You can optionally modify the settings before calling this method.
   // This WebFrame will receive events for the main frame and must not
   // be null.
   virtual void setMainFrame(WebFrame*) = 0;
 
   // Initializes the various client interfaces.
   virtual void setCredentialManagerClient(WebCredentialManagerClient*) = 0;
@@ skipping 358 matching lines @@
   // completed.
   WebWidget* widget() { return this; }
 
  protected:
   ~WebView() {}
 };
 
 }  // namespace blink
 
 #endif