Remove GYP annotations from third_party GN files.

third_party/widevine/cdm/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/chrome_build.gni")
 import("//build/config/features.gni")
 import("//chrome/process_version_rc_template.gni")
 import("//media/cdm/ppapi/cdm_paths.gni")
 import("//media/cdm/ppapi/ppapi_cdm_adapter.gni")
 import("//third_party/widevine/cdm/widevine.gni")
@@ skipping 33 matching lines @@
     widevine_cdm_version_h_file = "widevine_cdm_version.h"
   }
 } else if (enable_widevine) {
   widevine_cdm_version_h_file = "stub/widevine_cdm_version.h"
   widevine_cdm_manifest_file = [ "stub/manifest.json" ]
 } else {
   # No branding, use the default one.
   widevine_cdm_version_h_file = "widevine_cdm_version.h"
 }
 
-# GYP version: third_party/widevine/cdm/widevine_cdm.gyp:widevine_cdm_version_h
 copy("version_h") {
   sources = [
     widevine_cdm_version_h_file,
   ]
 
   # TODO(brettw) this should go into target_out_dir and callers should include
   # it from there. This requires, however, renaming the default
   # widevine_cdm_version.h in this directory to avoid conflicts.
   outputs = [
     "$root_gen_dir/widevine_cdm_version.h",
   ]
 }
 
-# GYP version: third_party/widevine/cdm/widevine_cdm.gyp:widevinecdm
 if (widevine_cdm_binary_files != []) {
   copy("widevinecdm") {
     sources = widevine_cdm_binary_files
     outputs = [
       "$root_out_dir/$widevine_cdm_path/{{source_file_part}}",
     ]
 
     # TODO(jrummell)
     # 'COPY_PHASE_STRIP': 'NO',
   }
@@ skipping 18 matching lines @@
     if (is_mac) {
       ldflags = [
         # Not to strip important symbols by -Wl,-dead_strip.
         "-Wl,-exported_symbol,_PPP_GetInterface",
         "-Wl,-exported_symbol,_PPP_InitializeModule",
         "-Wl,-exported_symbol,_PPP_ShutdownModule",
       ]
       #TODO(jrummell) Mac: 'DYLIB_INSTALL_NAME_BASE': '@loader_path',
     } else if (is_posix && !is_mac) {
       cflags = [ "-fvisibility=hidden" ]
-      # Note GYP sets rpath but this is set by default on shared libraries in
-      # the GN build.
     }
   }
 } else {
   group("widevinecdm") {
     # NOP
   }
 }
 
 if (widevine_cdm_manifest_file != []) {
   copy("widevine_cdm_manifest") {
@@ skipping 56 matching lines @@
 # on the license server.
 source_set("widevine_test_license_server") {
   if (is_chrome_branded && is_linux) {
     deps = [
       # TODO(jrummell)
       # This target should be removed and targets should have data_deps on this target:
       #"//third_party/widevine/test/license_server/license_server.gyp:test_license_server"
     ]
   }
 }