Remove safe_browsing=2 functionality, replace with =3 mode.

build/config/features.gni

 # Copyright 2014 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 contains Chrome-feature-related build flags (see ui.gni for
 # UI-related ones). These should theoretically be moved to the build files of
 # the features themselves.
 #
 # However, today we have many "bad" dependencies on some of these flags from,
 # e.g. base, so they need to be global to match the GYP configuration. Also,
@@ skipping 81 matching lines @@
   enable_video_hole = is_android
 
   # Enables browser side Content Decryption Modules. Required for embedders
   # (e.g. Android and ChromeCast) that use a browser side CDM.
   enable_browser_cdms = is_android || is_chromecast
 
   # Hangout services is an extension that adds extra features to Hangouts.
   # For official GYP builds, this flag is set.
   enable_hangout_services_extension = false
 
-  # Variable safe_browsing is used to control the build time configuration
-  # for safe browsing feature. Safe browsing can be compiled in 4 different
-  # levels: 0 disables it, 1 enables it fully, and 2 enables only UI and
-  # reporting features for use with Data Saver on Mobile, and 3 enables
-  # extended mobile protection via an external API.
+  # Variable safe_browsing is used to control the build time configuration for
+  # safe browsing feature. Safe browsing can be compiled in 3 different levels:
+  # 0 disables it, 1 enables it fully, and 2 enables mobile protection via an
+  # external API.
   if (is_android) {
-    safe_browsing_mode = 3
+    safe_browsing_mode = 2
   } else if (is_ios) {
     safe_browsing_mode = 0
   } else {
     safe_browsing_mode = 1
   }
 
   # Set to true make a build that disables activation of field trial tests
   # specified in testing/variations/fieldtrial_testing_config_*.json.
   # Note: this setting is ignored if is_chrome_branded.
   fieldtrial_testing_like_official_build = is_chrome_branded
@@ skipping 79 matching lines @@
 # Option controlling the use of GConf (the classic GNOME configuration
 # system).
 use_gconf = is_linux && !is_chromeos && !is_chromecast
 
 # Whether to back up data before sync.
 enable_pre_sync_backup = is_win || is_mac || (is_linux && !is_chromeos)
 
 # Enable WebVR support by default on Android
 # Still requires command line flag to access API
 enable_webvr = is_android