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

build/config/features.gni

Index: build/config/features.gni
diff --git a/build/config/features.gni b/build/config/features.gni
index f1cb1f8dea22148f429f3b190d45b9861afba72b..b238d63080921b5ed4c2d456652c6437e9bbb1d3 100644
--- a/build/config/features.gni
+++ b/build/config/features.gni
@@ -99,13 +99,12 @@ declare_args() {
   # 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 {