[infra] Translate _sources.gypi files to _sources.gni files

third_party/tcmalloc/BUILD.gn

 # Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
+import("tcmalloc_sources.gni")
+
 config("internal_config") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   cflags = [
     "-Wall",
     "-Wextra",
     "-Wno-missing-field-initializers",
     "-Wno-sign-compare",
     "-Wno-type-limits",
     "-Wno-unused-result",
     "-Wno-unused-parameter",
@@ skipping 40 matching lines @@
     "gperftools/src/base",
     "gperftools/src",
   ]
 
   sources = [
     "gperftools/src/base/dynamic_annotations.c",
     "gperftools/src/base/dynamic_annotations.h",
   ]
 }
 
-tcmalloc_sources_list = exec_script("../../tools/gypi_to_gn.py",
-                                    [ rebase_path("tcmalloc_sources.gypi") ],
-                                    "scope",
-                                    [ "tcmalloc_sources.gypi" ])
-
 source_set("tcmalloc") {
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ ":internal_config" ]
 
   public_configs = [ ":link_config" ]
 
   deps = [
     ":dynamic_annotations",
   ]
 
@@ skipping 41 matching lines @@
                                   # Not using the cpuprofiler
                                   "gperftools/src/base/thread_lister.c",
                                   "gperftools/src/base/thread_lister.h",
                                   "gperftools/src/profile-handler.cc",
                                   "gperftools/src/profile-handler.h",
                                   "gperftools/src/profiledata.cc",
                                   "gperftools/src/profiledata.h",
                                   "gperftools/src/profiler.cc",
                                 ])
 
-  sources = tcmalloc_sources_list.sources
+  sources = tcmalloc_sources
 }