Cleanup: Use http/https constants in components.

components/navigation_metrics/navigation_metrics.cc

 // 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.
 
 #include "components/navigation_metrics/navigation_metrics.h"
 
 #include "base/metrics/histogram.h"
 #include "url/gurl.h"
 
 namespace {
 
 enum Scheme {
   SCHEME_UNKNOWN,
   SCHEME_HTTP,
   SCHEME_HTTPS,
   SCHEME_FILE,
   SCHEME_FTP,
   SCHEME_DATA,
   SCHEME_JAVASCRIPT,
   SCHEME_ABOUT,
   SCHEME_CHROME,
   SCHEME_MAX,
 };
 
-static const char* kSchemeNames[] = {
+const char* const kSchemeNames[] = {
   "unknown",
-  "http",
-  "https",
-  "file",
-  "ftp",
-  "data",
-  "javascript",
-  "about",
+  url::kHttpScheme,
+  url::kHttpsScheme,
+  url::kFileScheme,
+  url::kFtpScheme,
+  url::kDataScheme,
+  url::kJavaScriptScheme,
+  url::kAboutScheme,
   "chrome",
   "max",
 };
 
 COMPILE_ASSERT(arraysize(kSchemeNames) == SCHEME_MAX + 1,
                NavigationMetricsRecorder_name_count_mismatch);
 
 }  // namespace
 
 namespace navigation_metrics {
 
 void RecordMainFrameNavigation(const GURL& url, bool is_in_page) {
   Scheme scheme = SCHEME_UNKNOWN;
   for (int i = 1; i < SCHEME_MAX; ++i) {
     if (url.SchemeIs(kSchemeNames[i])) {
       scheme = static_cast<Scheme>(i);
       break;
     }
   }
-  UMA_HISTOGRAM_ENUMERATION(
-      "Navigation.MainFrameScheme", scheme, SCHEME_MAX);
+  UMA_HISTOGRAM_ENUMERATION("Navigation.MainFrameScheme", scheme, SCHEME_MAX);
   if (!is_in_page) {
     UMA_HISTOGRAM_ENUMERATION(
         "Navigation.MainFrameSchemeDifferentPage", scheme, SCHEME_MAX);
   }
 }
 
 }  // namespace navigation_metrics