Keep All Bookmarks panel visible by default.

ios/chrome/browser/experimental_flags.mm

 // Copyright 2015 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.
 
 // This file can be empty. Its purpose is to contain the relatively short lived
 // definitions required for experimental flags.
 
 #include "ios/chrome/browser/experimental_flags.h"
 
 #include <dispatch/dispatch.h>
@@ skipping 92 matching lines @@
 }
 
 bool IsAllBookmarksEnabled() {
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kEnableAllBookmarksView)) {
     return true;
   } else if (command_line->HasSwitch(switches::kDisableAllBookmarksView)) {
     return false;
   }
 
-  // Check if the finch experiment is turned on. Flag is off by default.
+  // Check if the finch experiment exists.
   std::string group_name =
       base::FieldTrialList::FindFullName("RemoveAllBookmarks");
 
+  if (group_name.empty()) {
+    return true;  // If no finch experiment, keep all bookmarks enabled.
+  }
   return base::StartsWith(group_name, "Enabled",
                           base::CompareCase::INSENSITIVE_ASCII);
 }
 
 }  // namespace experimental_flags