[ios] Use web_state_list in web_contents_mediator.

ios/clean/chrome/browser/ui/web_contents/web_coordinator.h

Index: ios/clean/chrome/browser/ui/web_contents/web_coordinator.h
diff --git a/ios/clean/chrome/browser/ui/web_contents/web_coordinator.h b/ios/clean/chrome/browser/ui/web_contents/web_coordinator.h
index 1cb424d555578beb1420a1d32e932d6a7517b79d..addf34de8223d83afb72ef08648c0e6cb84d09cb 100644
--- a/ios/clean/chrome/browser/ui/web_contents/web_coordinator.h
+++ b/ios/clean/chrome/browser/ui/web_contents/web_coordinator.h
@@ -7,17 +7,9 @@
 
 #import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator.h"
 
-namespace web {
-class WebState;
-}
-
 // A coordinator for a UI element that displays the web view associated with
-// |webState|.
+// the current active web state.
 @interface WebCoordinator : BrowserCoordinator
-
-// The web state this coordinator is displaying.
-@property(nonatomic, assign) web::WebState* webState;
-
 @end
 
 #endif  // IOS_CLEAN_CHROME_BROWSER_UI_WEB_CONTENTS_WEB_COORDINATOR_H_