Remove som GYP annotations, remove unused manifest.

third_party/WebKit/Source/build/scripts/scripts.gni

 # 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("//third_party/WebKit/Source/config.gni")
 
 # All paths in this file should be absolute so targets in any directory can use
 # them without worrying about the current directory.
 _scripts_dir = "//third_party/WebKit/Source/build/scripts"
 
@@ skipping 55 matching lines @@
   bison_exe = rebase_path("//third_party/bison/bin/bison.exe", root_build_dir)
 } else {
   gperf_exe = "gperf"
   bison_exe = "bison"
 }
 
 # Templates --------------------------------------------------------------------
 
 _blink_gen_dir = "$root_gen_dir/blink"
 
-# The GYP target make_core_generated has some deps and a bunch of actions on
-# it, which means that the deps will be resolved before the actions run. Here
-# we have separate targets for each action. Its not clear which actions depend
-# on these deps, so for GYP compatibility, all of the below actions should
-# depend on the following deps.
 make_core_generated_deps = [
   "//third_party/WebKit/Source/core:generated_testing_idls",
   "//third_party/WebKit/Source/core:core_event_interfaces",
 ]
 
 # Template to run most of scripts that process "*.in" files.
 #   script: script to run.
 #   in_files: ".in" files to pass to the script
 #   other_inputs: (optional) other input files the script depends on
 #                 defaults to "scripts_for_in_files" (if specified, we assume
 #                 that the contents of "scripts_for_in_files" are included in
-#                 this list specified since this is how these lists are filled
-#                 from the GYP build.
+#                 this list).
 #   outputs: expected results. Note that the directory of the 0th item in this
 #            list will be taken to be the output path.
 #   other_args: (optional) other arguments to pass to the script.
 #   deps [optional]:
 #     Depenendencies. If unspecified defaults to make_core_generated_deps.
 template("process_in_files") {
   action(target_name) {
     script = invoker.script
 
     inputs = invoker.in_files
@@ skipping 89 matching lines @@
     other_inputs = make_event_factory_files
     forward_variables_from(invoker,
                            [
                              "deps",
                              "in_files",
                              "outputs",
                              "visibility",
                            ])
   }
 }