Revert of Showing previews UI for Offline Previews

chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc

 // Copyright 2016 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 "chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.h"
 
 #include <string>
 
 #include "base/optional.h"
 #include "base/time/time.h"
@@ skipping 94 matching lines @@
   }
   PAGE_LOAD_HISTOGRAM(internal::kHistogramOfflinePreviewsParseStart,
                       timing.parse_start.value());
 }
 
 bool PreviewsPageLoadMetricsObserver::IsOfflinePreview(
     content::WebContents* web_contents) const {
 #if BUILDFLAG(ANDROID_JAVA_UI)
   offline_pages::OfflinePageTabHelper* tab_helper =
       offline_pages::OfflinePageTabHelper::FromWebContents(web_contents);
-  return tab_helper && tab_helper->IsShowingOfflinePreview();
+  return tab_helper && tab_helper->is_offline_preview();
 #else
   return false;
 #endif  // BUILDFLAG(ANDROID_JAVA_UI)
 }
 
 }  // namespace previews