Fix for setting the os listed in metrics reporting for Blimp.

components/metrics/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.
 
 declare_args() {
   # Overrides os name in uma metrics log to "Blimp".
   metrics_use_blimp = false
 }
 
+# These are only used by the blimp team, which has entirely migrated to gn,
+# so this logic is not replicated in the gyp file.
+if (metrics_use_blimp) {
+  defines = [ "OVERRIDE_OS_NAME_TO_BLIMP" ]
+}
+
 # GYP version: components/metrics.gypi:metrics
 source_set("metrics") {
   sources = [
     "call_stack_profile_metrics_provider.cc",
     "call_stack_profile_metrics_provider.h",
     "clean_exit_beacon.cc",
     "clean_exit_beacon.h",
     "client_info.cc",
     "client_info.h",
     "cloned_install_detector.cc",
@@ skipping 339 matching lines @@
   ]
 
   if (is_linux) {
     sources += [ "serialization/serialization_utils_unittest.cc" ]
     deps += [ ":serialization" ]
   }
 
   if (is_chromeos) {
     deps += [ ":leak_detector_unit_tests" ]
   }
-
-  # These are only used by the blimp team, which has entirely migrated to gn,
-  # so this logic is not replicated in the gyp file.
-  if (metrics_use_blimp) {
-    defines = [ "OVERRIDE_OS_NAME_TO_BLIMP" ]
-  }
 }