Move base GN subprojects into base.

base/json/BUILD.gn

Index: base/json/BUILD.gn
diff --git a/base/json/BUILD.gn b/base/json/BUILD.gn
deleted file mode 100644
index 5cb42a3249ad569ed6895a84340b21482a354d07..0000000000000000000000000000000000000000
--- a/base/json/BUILD.gn
+++ /dev/null
@@ -1,39 +0,0 @@
-# Copyright (c) 2013 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.
-
-import("//build/config/nacl/config.gni")
-
-source_set("json") {
-  sources = [
-    "json_file_value_serializer.cc",
-    "json_file_value_serializer.h",
-    "json_parser.cc",
-    "json_parser.h",
-    "json_reader.cc",
-    "json_reader.h",
-    "json_string_value_serializer.cc",
-    "json_string_value_serializer.h",
-    "json_value_converter.cc",
-    "json_value_converter.h",
-    "json_writer.cc",
-    "json_writer.h",
-    "string_escape.cc",
-    "string_escape.h",
-  ]
-
-  if (is_nacl && !is_nacl_nonsfi) {
-    sources -= [
-      "json_file_value_serializer.cc",
-      "json_file_value_serializer.h",
-    ]
-  }
-
-  configs += [ "//base:base_implementation" ]
-
-  deps = [
-    "//base/memory",
-  ]
-
-  visibility = [ "//base/*" ]
-}