Reorganize Blink IDL build, delete obsolete GYP files.

third_party/WebKit/Source/modules/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/split_static_library.gni")
 import("//build/config/chromecast_build.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/bindings/modules/v8/generated.gni")
 import("//third_party/WebKit/Source/bindings/modules/v8/v8.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
+import("//third_party/WebKit/Source/modules/modules_idl_files.gni")
 
 visibility = [ "//third_party/WebKit/Source/*" ]
 
 if (!is_component_build && is_win && is_official_build) {
   # This target as a static library (for non-component builds) is >2GB for
   # official builds on Windows. This causes linking fail. As a workaround,
   # force using a split static library for this configuration.
   modules_target_type = "split_static_library"
 } else {
   modules_target_type = "component"
@@ skipping 215 matching lines @@
     ":modules",
     ":modules_testing",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/Source/core",
     "//third_party/WebKit/Source/wtf",
     "//v8",
   ]
 }