[Enhanced Bookmarks] Make enhanced bookmarks default for Android.

components/enhanced_bookmarks/enhanced_bookmark_features.cc

-// 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.
-
-#include "components/enhanced_bookmarks/enhanced_bookmark_features.h"
-
-#include <string>
-
-#include "base/command_line.h"
-#include "build/build_config.h"
-#include "components/enhanced_bookmarks/enhanced_bookmark_switches.h"
-#include "components/offline_pages/offline_page_feature.h"
-#include "components/variations/variations_associated_data.h"
-
-#if defined(OS_IOS) || defined(OS_ANDROID)
-
-namespace enhanced_bookmarks {
-namespace {
-const char kFieldTrialName[] = "EnhancedBookmarks";
-}  // namespace
-
-bool IsEnhancedBookmarksEnabled() {
-#if defined(OS_ANDROID)
-  // If offline pages feature is enabled, also enable enhanced bookmarks feature
-  // regardless its state.
-  if (offline_pages::IsOfflinePagesEnabled())
-    return true;
-#endif
-
-  // kEnhancedBookmarksExperiment flag could have values "", "1" and "0".  "" -
-  // default, "0" - user opted out, "1" - user opted in.  Tests also use the
-  // command line flag to force enhanced bookmark to be on.
-  std::string switch_value =
-      base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
-          switches::kEnhancedBookmarksExperiment);
-  if (switch_value == "1")
-    return true;
-  if (switch_value == "0")
-    return false;
-
-  // Check that the "id" param is present. This is a legacy of the desktop
-  // implementation providing the extension id via param. This probably should
-  // be replaced with code that checks the experiment name instead.
-  return !variations::GetVariationParamValue(kFieldTrialName, "id").empty();
-}
-
-}  // namespace enhanced_bookmarks
-
-#endif