Reorganize Blink IDL build, delete obsolete GYP files.

third_party/WebKit/Source/core/BUILD.gn

 # 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.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
-import("//third_party/WebKit/Source/bindings/modules/modules.gni")
 import("//third_party/WebKit/Source/bindings/modules/v8/generated.gni")
 import("//third_party/WebKit/Source/bindings/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
+import("//third_party/WebKit/Source/modules/modules_idl_files.gni")
 import("//third_party/WebKit/Source/platform/platform_generated.gni")
 
 visibility = [ "//third_party/WebKit/Source/*" ]
 
 rel_blink_core_gen_dir = rebase_path(blink_core_output_dir, root_build_dir)
 
 # Config for code that builds as part of core.
 config("config") {
   defines = [ "BLINK_CORE_IMPLEMENTATION=1" ]
 
@@ skipping 1209 matching lines @@
   sources = [
     "html/parser/HTMLPreloadScannerFuzzer.cpp",
     "html/parser/TextResourceDecoderForFuzzing.h",
   ]
   seed_corpus = "//third_party/WebKit/LayoutTests/fast/parser"
   deps = [
     ":core",
     "../platform:blink_fuzzer_test_support",
   ]
 }