Move json schema compiler target into build/ to match gyp

build/json_schema_compile.gypi

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     # When including this gypi, the following variables must be set:
     #   schema_files:
     #     An array of json or idl files that comprise the api model.
     #   schema_include_rules (optional):
     #     An array of paths to include when searching for referenced objects,
     #     with the namespace separated by a :.
     #     Example:
     #       [ '/foo/bar:Foo::Bar::%(namespace)s' ]
     #   cc_dir:
     #     The directory to put the generated code in.
     #   root_namespace:
     #     A Python string substituion pattern used to generate the C++
     #     namespace for each API. Use %(namespace)s to replace with the API
     #     namespace, like "toplevel::%(namespace)s_api".
     #
     # Functions and namespaces can be excluded by setting "nocompile" to true.
     'api_gen_dir': '<(DEPTH)/tools/json_schema_compiler',
     'api_gen': '<(api_gen_dir)/compiler.py',
     'schema_include_rules': [],
   },
   'rules': [
     {
-      # GN version: //extensions/generated_extensions_api.gni
+      # GN version: json_schema_compile.gni
       'rule_name': 'genapi',
       'msvs_external_rule': 1,
       'extension': 'json',
       'inputs': [
         '<(api_gen_dir)/cc_generator.py',
         '<(api_gen_dir)/code.py',
         '<(api_gen_dir)/compiler.py',
         '<(api_gen_dir)/cpp_generator.py',
         '<(api_gen_dir)/cpp_type_generator.py',
         '<(api_gen_dir)/cpp_util.py',
@@ skipping 74 matching lines @@
   ],
   'direct_dependent_settings': {
     'include_dirs': [
       '<(SHARED_INTERMEDIATE_DIR)',
     ]
   },
   # This target exports a hard dependency because it generates header
   # files.
   'hard_dependency': 1,
 }