Moved window opening callback to WebStateDelegate.

ios/web/public/web_state/web_state_delegate.h

 // Copyright 2016 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.
 
 #ifndef IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_DELEGATE_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_DELEGATE_H_
 
 #include <set>
 
 #import <Foundation/Foundation.h>
 
 #include "base/callback.h"
 #import "ios/web/public/web_state/web_state.h"
 
 namespace web {
 
 struct ContextMenuParams;
 class JavaScriptDialogPresenter;
 
 // Objects implement this interface to get notified about changes in the
 // WebState and to provide necessary functionality.
 class WebStateDelegate {
  public:
   WebStateDelegate();
 
+  // Called when |source| wants to open a new window. |url| is the URL of
+  // the new window; |opener_url| is the URL of the page which requested a
+  // window to be open; |initiated_by_user| is true if action was caused by the
+  // user. |source| will not open a window if this method returns nil. This
+  // method can not return |source|.
+  virtual WebState* CreateNewWebState(WebState* source,
+                                      const GURL& url,
+                                      const GURL& opener_url,
+                                      bool initiated_by_user);
+
   // Returns the WebState the URL is opened in, or nullptr if the URL wasn't
   // opened immediately.
   virtual WebState* OpenURLFromWebState(WebState*,
                                         const WebState::OpenURLParams&);
 
   // Notifies the delegate that the user triggered the context menu with the
   // given |ContextMenuParams|. Returns true if the context menu operation was
   // handled by the delegate.
   virtual bool HandleContextMenu(WebState* source,
                                  const ContextMenuParams& params);
@@ skipping 34 matching lines @@
   // Called when |this| is no longer the WebStateDelegate for |source|.
   void Detach(WebState* source);
 
   // The WebStates for which |this| is currently a delegate.
   std::set<WebState*> attached_states_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_DELEGATE_H_