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

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index c22e542ad009332848205b43fb164c5a5d66c7d0..eb4d0f4ec6d224d67e763b54c3172f8da6f9cc5c 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -503,11 +503,11 @@ source_set("browser") {
       if (is_win) {
         deps += [ "//chrome/browser/safe_browsing/incident_reporting:state_store_data_proto" ]
       }
-    } else if (safe_browsing_mode == 3) {
-      sources += rebase_path(
-              gypi_values.chrome_browser_safe_browsing_mobile_extended_sources,
-              ".",
-              "//chrome")
+    } else if (safe_browsing_mode == 2) {
+      sources +=
+          rebase_path(gypi_values.chrome_browser_safe_browsing_mobile_sources,
+                      ".",
+                      "//chrome")
     }
   }