Remove useless FaviconHandler::PageChangedSinceFaviconWasRequested()

components/favicon/ios/web_favicon_driver.cc

 // 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.
 
 #include "components/favicon/ios/web_favicon_driver.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "components/favicon/core/favicon_url.h"
 #include "components/favicon/ios/favicon_url_util.h"
@@ skipping 15 matching lines @@
     history::HistoryService* history_service,
     bookmarks::BookmarkModel* bookmark_model) {
   if (FromWebState(web_state))
     return;
 
   web_state->SetUserData(UserDataKey(),
                          new WebFaviconDriver(web_state, favicon_service,
                                               history_service, bookmark_model));
 }
 
+void WebFaviconDriver::FetchFavicon(const GURL& url) override {
+  fetch_favicon_url_ = url;
+  FaviconDriverImpl::FetchFavicon(url);
+}
+
 void WebFaviconDriver::SaveFavicon() {
   NOTREACHED();
 }
 
 gfx::Image WebFaviconDriver::GetFavicon() const {
   web::NavigationItem* item =
       web_state()->GetNavigationManager()->GetLastCommittedItem();
   return item ? item->GetFavicon().image : gfx::Image();
 }
 
@@ skipping 39 matching lines @@
 }
 
 void WebFaviconDriver::SetActiveFaviconURL(const GURL& url) {
   GetFaviconStatus().url = url;
 }
 
 void WebFaviconDriver::SetActiveFaviconImage(const gfx::Image& image) {
   GetFaviconStatus().image = image;
 }
 
+bool WebFaviconDriver::ShouldSendFaviconAvailableNotifications() override {
+  // On iOS the active URL can change in between calls to FetchFavicon(). For
+  // instance, FetchFavicon() is not synchronously called when the active URL
+  // changes as a result of CRWSessionController::goToEntry(). FaviconHandler

[pkotwicz, 2015/08/23 19:59:47]

FetchFavicon() is called by
CRWUIWebViewWebController::checkForUnexpectedURLChange() asynchronously as a
result of CRWSessionController::goToEntry()

+  // sends notifications with the assumption that the active URL has not
+  // changed. Suppress FaviconHandler notifications if the active URL has
+  // changed.
+  return GetActiveURL() == fetch_favicon_url_;
+}
+
 web::FaviconStatus& WebFaviconDriver::GetFaviconStatus() {
-  DCHECK(web_state()->GetNavigationManager()->GetVisibleItem());
-  return web_state()->GetNavigationManager()->GetVisibleItem()->GetFavicon();
+  web::NavigationItem* item =
+      web_state()->GetNavigationManager()->GetVisibleItem();
+  return item ? item->GetFavicon() : web::FaviconStatus();
 }
 
 WebFaviconDriver::WebFaviconDriver(web::WebState* web_state,
                                    FaviconService* favicon_service,
                                    history::HistoryService* history_service,
                                    bookmarks::BookmarkModel* bookmark_model)
     : web::WebStateObserver(web_state),
       FaviconDriverImpl(favicon_service, history_service, bookmark_model) {
 }
 
 WebFaviconDriver::~WebFaviconDriver() {
 }
 
 void WebFaviconDriver::FaviconUrlUpdated(
     const std::vector<web::FaviconURL>& candidates) {
   DCHECK(!candidates.empty());
   OnUpdateFaviconURL(FaviconURLsFromWebFaviconURLs(candidates));
 }
 
 }  // namespace favicon