Use .service.exe extension for service binaries on Windows

services/service_manager/public/cpp/service.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("//build/toolchain/toolchain.gni")
 import("//services/service_manager/public/constants.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
   import("//build/config/zip.gni")
@@ skipping 35 matching lines @@
       }
       deps = service_deps
     }
     service_data_deps += [ ":$copy_step_name" ]
   }
 
   if (defined(invoker.data_deps)) {
     service_data_deps += invoker.data_deps
   }
 
+  if (is_win) {
+    executable_extension = "service.exe"
+  } else {
+    executable_extension = "service"
+  }
+
   executable_target_name = base_target_name + "_executable"
-  executable_name = base_target_name + ".service"
+  executable_name = base_target_name + "." + executable_extension
 
   executable(executable_target_name) {
     output_name = base_target_name
-    output_extension = "service"
+    output_extension = executable_extension
 
     if (defined(invoker.cflags)) {
       cflags = invoker.cflags
     }
     if (defined(invoker.cflags_c)) {
       cflags_c = invoker.cflags_c
     }
     if (defined(invoker.cflags_cc)) {
       cflags_cc = invoker.cflags_cc
     }
@@ skipping 76 matching lines @@
     data_deps = service_data_deps
 
     sources = [
       "${root_out_dir}/${executable_name}",
     ]
     outputs = [
       "${root_out_dir}/${packages_directory}/${base_target_name}/${executable_name}",
     ]
   }
 }