Revert of Showing previews UI for Offline Previews

chrome/browser/android/offline_pages/offline_page_tab_helper.cc

Index: chrome/browser/android/offline_pages/offline_page_tab_helper.cc
diff --git a/chrome/browser/android/offline_pages/offline_page_tab_helper.cc b/chrome/browser/android/offline_pages/offline_page_tab_helper.cc
index 6e41b3284ba1c7ce3fae469cab4b6c5a13cb703e..9858838ba12151d848a41b65c9d6419076dd28ea 100644
--- a/chrome/browser/android/offline_pages/offline_page_tab_helper.cc
+++ b/chrome/browser/android/offline_pages/offline_page_tab_helper.cc
@@ -29,7 +29,7 @@
 void OfflinePageTabHelper::LoadedOfflinePageInfo::Clear() {
   offline_page.reset();
   offline_header.Clear();
-  is_showing_offline_preview = false;
+  is_offline_preview = false;
 }
 
 OfflinePageTabHelper::OfflinePageTabHelper(content::WebContents* web_contents)
@@ -87,8 +87,8 @@
     offline_info_.offline_page =
         std::move(provisional_offline_info_.offline_page);
     offline_info_.offline_header = provisional_offline_info_.offline_header;
-    offline_info_.is_showing_offline_preview =
-        provisional_offline_info_.is_showing_offline_preview;
+    offline_info_.is_offline_preview =
+        provisional_offline_info_.is_offline_preview;
   }
   provisional_offline_info_.Clear();
 
@@ -170,18 +170,11 @@
   provisional_offline_info_.offline_page =
       base::MakeUnique<OfflinePageItem>(offline_page);
   provisional_offline_info_.offline_header = offline_header;
-  provisional_offline_info_.is_showing_offline_preview = is_offline_preview;
+  provisional_offline_info_.is_offline_preview = is_offline_preview;
 }
 
 const OfflinePageItem* OfflinePageTabHelper::GetOfflinePageForTest() const {
   return provisional_offline_info_.offline_page.get();
 }
 
-bool OfflinePageTabHelper::IsShowingOfflinePreview() const {
-  // TODO: Change this once offline pages infrastructure uses NavigationHandle
-  // instead of a back channel. crbug.com/658899
-  return provisional_offline_info_.is_showing_offline_preview ||
-         offline_info_.is_showing_offline_preview;
-}
-
 }  // namespace offline_pages