[Offline Pages] Removes the deprecated IsOfflinePages synthetic flag since no uses of it remain.

chrome/browser/android/offline_pages/offline_page_bridge.cc

Index: chrome/browser/android/offline_pages/offline_page_bridge.cc
diff --git a/chrome/browser/android/offline_pages/offline_page_bridge.cc b/chrome/browser/android/offline_pages/offline_page_bridge.cc
index bd20fa128983d3d8641cb46c04f37e2fb3aa0913..1066e8c59e54844d4e54c71d5b0ea22cc3a142e0 100644
--- a/chrome/browser/android/offline_pages/offline_page_bridge.cc
+++ b/chrome/browser/android/offline_pages/offline_page_bridge.cc
@@ -198,11 +198,6 @@ void OnRemoveRequestsDone(
 
 }  // namespace
 
-static jboolean IsOfflinePagesEnabled(JNIEnv* env,
-                                          const JavaParamRef<jclass>& clazz) {
-  return offline_pages::IsOfflinePagesEnabled();
-}
-
 static jboolean IsOfflineBookmarksEnabled(JNIEnv* env,
                                           const JavaParamRef<jclass>& clazz) {
   return offline_pages::IsOfflineBookmarksEnabled();