Move Navigation.MainFrameScheme UMA recording to //components.

components/navigation_metrics.gypi

 # Copyright 2013 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.
 
 {
   'targets': [
     {
-      'target_name': 'startup_metric_utils',
+      'target_name': 'navigation_metrics',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
+        '../url/url.gyp:url_lib',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
-        'startup_metric_utils/startup_metric_utils.cc',
-        'startup_metric_utils/startup_metric_utils.h',
+        'navigation_metrics/navigation_metrics.cc',
+        'navigation_metrics/navigation_metrics.h',
       ],
     },
   ],
 }