Do not override deprecated NavigationItemChanged in IOSChromeLocalSessionEventRouter.

NavigationItemChanged is called in 2 cases:
1.) title was changed for navigation item
2.) window.location.replace API was called

Case #1 can be tracked with TitleWasSet and case #2 can be tarcked with
DidFinishNavigation.

IOSChromeLocalSessionEventRouter already overrides DidFinishNavigation,
so this CL replaces NavigationItemChanged with TitleWasSet.

Bug: 720786
Change-Id: I15f839467cc2541308823038eae86ec9a6a9a9e0
Reviewed-on: https://chromium-review.googlesource.com/c/1369053
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615696}

ios/chrome/browser/sync/sessions/ios_chrome_local_session_event_router.h

@@ -58,7 +58,7 @@ class IOSChromeLocalSessionEventRouter
   // web::WebStateObserver:
   void NavigationItemsPruned(web::WebState* web_state,
                              size_t pruned_item_count) override;
-  void NavigationItemChanged(web::WebState* web_state) override;
+  void TitleWasSet(web::WebState* web_state) override;
   void DidFinishNavigation(web::WebState* web_state,
                            web::NavigationContext* navigation_context) override;
   void PageLoaded(

ios/chrome/browser/sync/sessions/ios_chrome_local_session_event_router.mm

@@ -117,8 +117,7 @@ void IOSChromeLocalSessionEventRouter::NavigationItemsPruned(
   OnWebStateChange(web_state);
 }
 
-void IOSChromeLocalSessionEventRouter::NavigationItemChanged(
-    web::WebState* web_state) {
+void IOSChromeLocalSessionEventRouter::TitleWasSet(web::WebState* web_state) {
   OnWebStateChange(web_state);
 }