ui: Cleanup class/struct forward declarations

ios/web/web_state/ui/crw_web_controller.h

Index: ios/web/web_state/ui/crw_web_controller.h
diff --git a/ios/web/web_state/ui/crw_web_controller.h b/ios/web/web_state/ui/crw_web_controller.h
index bce20fe019eedf18c256d380774cecdc3993e4de..643bbe4b652913fd6c45917378e2ff6f5bbc5b8f 100644
--- a/ios/web/web_state/ui/crw_web_controller.h
+++ b/ios/web/web_state/ui/crw_web_controller.h
@@ -278,14 +278,6 @@ class WebStateImpl;
 // native controller.
 - (void)loadErrorInNativeView:(NSError*)error;
 
-// Helper method called at the end of history navigation methods goBack,
-// goForward, and goDelta.  Loads a new URL if the current entry is not from a
-// pushState() navigation from |fromEntry|. |fromEntry| is the
-// CRWSessionEntry that was the current entry prior to the navigation.
-// TODO(rohitrao): This is only exposed so Tab can call it temporarily.  Remove
-// as soon as all the Tab calls have moved into CRWWebController.
-- (void)finishHistoryNavigationFromEntry:(CRWSessionEntry*)fromEntry;
-
 // Returns the native controller (if any) current mananging the content.
 - (id<CRWNativeContent>)nativeController;
 @end