Consolidates accessing and setting the UMA pref to be within metrics code

chrome/browser/resources/options/browser_options.html

Index: chrome/browser/resources/options/browser_options.html
diff --git a/chrome/browser/resources/options/browser_options.html b/chrome/browser/resources/options/browser_options.html
index 4e9c4eddac6d07af622e63d1c68c7cbe812552b5..187de01ed4bacf0f4c18622f8b2951f564df9444 100644
--- a/chrome/browser/resources/options/browser_options.html
+++ b/chrome/browser/resources/options/browser_options.html
@@ -393,13 +393,12 @@
           </span>
 </if>
 <if expr="not chromeos">
-          <input id="metricsReportingEnabled"
-              pref="user_experience_metrics.reporting_enabled" type="checkbox">
+          <input id="metricsReportingEnabled" type="checkbox">
           <span>
             <label for="metricsReportingEnabled" i18n-content="enableLogging">
             </label>
-            <span class="controlled-setting-indicator"
-                pref="user_experience_metrics.reporting_enabled">
+            <span id="metrics-reporting-disabled-icon"
+                class="controlled-setting-indicator">
             </span>
             <span id="metrics-reporting-reset-restart">
               <!-- Text filled by JavaScript -->