Remove android_java_ui as it is not used

chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc
index a9e0815c083ae27784bd7b9fe4baace2185c6dbf..6b697704cb975ca7b13ebcc81c0da9b6fff672bf 100644
--- a/chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc
@@ -14,9 +14,9 @@
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/web_contents.h"
 
-#if BUILDFLAG(ANDROID_JAVA_UI)
+#if defined(OS_ANDROID)
 #include "chrome/browser/android/offline_pages/offline_page_tab_helper.h"
-#endif  // BUILDFLAG(ANDROID_JAVA_UI)
+#endif  // defined(OS_ANDROID)
 
 namespace previews {
 
@@ -109,13 +109,13 @@ void PreviewsPageLoadMetricsObserver::OnParseStart(
 
 bool PreviewsPageLoadMetricsObserver::IsOfflinePreview(
     content::WebContents* web_contents) const {
-#if BUILDFLAG(ANDROID_JAVA_UI)
+#if defined(OS_ANDROID)
   offline_pages::OfflinePageTabHelper* tab_helper =
       offline_pages::OfflinePageTabHelper::FromWebContents(web_contents);
   return tab_helper && tab_helper->IsShowingOfflinePreview();
 #else
   return false;
-#endif  // BUILDFLAG(ANDROID_JAVA_UI)
+#endif  // defined(OS_ANDROID)
 }
 
 }  // namespace previews