[ios] WebStateList owns all WebState it manages.

ios/chrome/browser/ui/contextual_search/contextual_search_controller.h

 // Copyright 2015 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_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #include "base/ios/block_types.h"
 #include "base/strings/string16.h"
 #include "ios/chrome/browser/ui/contextual_search/panel_configuration.h"
 
 namespace ios {
 class ChromeBrowserState;
 }
 
 namespace web {
 class WebState;
 }
 
 class GURL;
 @class Tab;
 @class TouchToSearchPermissionsMediator;
+struct WebStateOpener;
 
 namespace ContextualSearch {
 // Possible reason for panel state changes.
 enum StateChangeReason {
   UNKNOWN,
   RESET,
   BACK_PRESS,  // This is Android-only; we should never use this value.
   TEXT_SELECT_TAP,
   TEXT_SELECT_LONG_PRESS,
   INVALID_SELECTION,
   BASE_PAGE_TAP,
   BASE_PAGE_SCROLL,
   SEARCH_BAR_TAP,
   SERP_NAVIGATION,
   TAB_PROMOTION,
   CLICK,
   SWIPE,  // Moved by going to the nearest state when a drag ends.
   FLING,  // Moved by interpolating a drag with velocity.
   OPTIN,
   OPTOUT
 };
 }  // namespace ContextualSearch
 
 @class ContextualSearchController;
 @class ContextualSearchPanelView;
 @class ContextualSearchResultsView;
 
 @protocol ContextualSearchTabProvider<NSObject>
-// Disassociate the internal Tab object from this view and return it.
-- (Tab*)releaseTab;
+// Disassociate the internal WebState from this view and return it.
+- (std::unique_ptr<web::WebState>)releaseWebState;
+// Information about the opener of the internal WebState.
+- (WebStateOpener)webStateOpener;
 @end
 
 @protocol ContextualSearchControllerDelegate<NSObject>
 
 // Called by the controller when it has tab content for the delegate to load
 // and display as a new tab; the content is provided by -releaseSearchTab.
 // |focusInput| indicates that the after promoting the tab, the delegate must
 // focus the main input.
 - (void)promotePanelToTabProvidedBy:(id<ContextualSearchTabProvider>)tabProvider
                          focusInput:(BOOL)focusInput;
@@ skipping 51 matching lines @@
 @end
 
 // Testing category that allows a permissions class to be injected.
 @interface ContextualSearchController (Testing)
 
 - (void)setPermissions:(TouchToSearchPermissionsMediator*)permissions;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_CONTROLLER_H_