Use TabStripModelObserver's new API in chrome/browser/extensions

Replace old API with new API. This CL is a refactor
ans has no intended behavior change.

Bug: 842194
Change-Id: I46e242b51c99ef720ee6700ab6bf0fdc8c2a4720
Reviewed-on: https://chromium-review.googlesource.com/1174582Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Sang Woo Ko <sangwoo108@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583318}

chrome/browser/extensions/api/web_navigation/web_navigation_api.cc

@@ -88,25 +88,32 @@ bool WebNavigationEventRouter::ShouldTrackBrowser(Browser* browser) {
   return profile_->IsSameProfile(browser->profile());
 }
 
-void WebNavigationEventRouter::TabReplacedAt(
+void WebNavigationEventRouter::OnTabStripModelChanged(
     TabStripModel* tab_strip_model,
-    content::WebContents* old_contents,
-    content::WebContents* new_contents,
-    int index) {
+    const TabStripModelChange& change,
+    const TabStripSelectionChange& selection) {
+  if (change.type() != TabStripModelChange::kReplaced)
+    return;
+
+  for (const auto& delta : change.deltas()) {
+    content::WebContents* old_contents = delta.replace.old_contents;
+    content::WebContents* new_contents = delta.replace.new_contents;
+
     WebNavigationTabObserver* tab_observer =
         WebNavigationTabObserver::Get(old_contents);
     if (!tab_observer) {
       // If you hit this DCHECK(), please add reproduction steps to
       // http://crbug.com/109464.
       DCHECK(GetViewType(old_contents) != VIEW_TYPE_TAB_CONTENTS);
-    return;
+      continue;
     }
     if (!FrameNavigationState::IsValidUrl(old_contents->GetURL()) ||
         !FrameNavigationState::IsValidUrl(new_contents->GetURL()))
-    return;
+      continue;
 
     web_navigation_api_helpers::DispatchOnTabReplaced(old_contents, profile_,
                                                       new_contents);
+  }
 }
 
 void WebNavigationEventRouter::Observe(

chrome/browser/extensions/api/web_navigation/web_navigation_api.h

@@ -148,10 +148,10 @@ class WebNavigationEventRouter : public TabStripModelObserver,
   bool ShouldTrackBrowser(Browser* browser) override;
 
   // TabStripModelObserver implementation.
-  void TabReplacedAt(TabStripModel* tab_strip_model,
-                     content::WebContents* old_contents,
-                     content::WebContents* new_contents,
-                     int index) override;
+  void OnTabStripModelChanged(
+      TabStripModel* tab_strip_model,
+      const TabStripModelChange& change,
+      const TabStripSelectionChange& selection) override;
 
   // content::NotificationObserver implementation.
   void Observe(int type,