Remove History.ClearBrowsingData.TimeSpentInDialog histogram

this histogram expired since M85 branch out.
so remove this historam.

Bug: 1088836
Change-Id: I1b05d0773d1f8d83200ff815eb667c72c057727a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2588676Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Hwanseung Lee <hs1217.lee@samsung.com>
Cr-Commit-Position: refs/heads/master@{#837500}

chrome/android/java/src/org/chromium/chrome/browser/browsing_data/ClearBrowsingDataFragment.java

@@ -9,7 +9,6 @@ import android.app.ProgressDialog;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
-import android.os.SystemClock;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -213,9 +212,6 @@ public abstract class ClearBrowsingDataFragment extends PreferenceFragmentCompat
     // important domains from being cleared.
     private ConfirmImportantSitesDialogFragment mConfirmImportantSitesDialog;
 
-    // Time in ms, when the dialog was created.
-    private long mDialogOpened;
-
     /**
      * @return All available {@link DialogOption} entries.
      */
@@ -328,9 +324,6 @@ public abstract class ClearBrowsingDataFragment extends PreferenceFragmentCompat
             dataTypes.add(getDataType(option));
         }
 
-        RecordHistogram.recordMediumTimesHistogram("History.ClearBrowsingData.TimeSpentInDialog",
-                SystemClock.elapsedRealtime() - mDialogOpened);
-
         final @CookieOrCacheDeletionChoice int choice;
         if (dataTypes.contains(BrowsingDataType.COOKIES)) {
             choice = dataTypes.contains(BrowsingDataType.CACHE)
@@ -522,7 +515,6 @@ public abstract class ClearBrowsingDataFragment extends PreferenceFragmentCompat
         if (savedInstanceState != null) {
             mFetcher = savedInstanceState.getParcelable(CLEAR_BROWSING_DATA_FETCHER);
         }
-        mDialogOpened = SystemClock.elapsedRealtime();
         getActivity().setTitle(R.string.clear_browsing_data_title);
         SettingsUtils.addPreferencesFromResource(this, R.xml.clear_browsing_data_preferences_tab);
         List<Integer> options = getDialogOptions();

chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.js

@@ -201,15 +201,6 @@ Polymer({
           'computeHasOtherError_(syncStatus, isSyncPaused_, hasPassphraseError_)',
     },
 
-    /**
-     * Time in ms, when the dialog was opened.
-     * @private
-     */
-    dialogOpenedTime_: {
-      type: Number,
-      value: 0,
-    },
-
     /** @private {Array<string>} */
     tabsNames_: {
       type: Array,
@@ -261,7 +252,6 @@ Polymer({
   /** @override */
   attached() {
     this.browserProxy_ = ClearBrowsingDataBrowserProxyImpl.getInstance();
-    this.dialogOpenedTime_ = Date.now();
     this.browserProxy_.initialize().then(() => {
       this.$.clearBrowsingDataDialog.showModal();
     });
@@ -311,7 +301,6 @@ Polymer({
   currentRouteChanged(currentRoute) {
     if (currentRoute === routes.CLEAR_BROWSER_DATA) {
       chrome.metricsPrivate.recordUserAction('ClearBrowsingData_DialogCreated');
-      this.dialogOpenedTime_ = Date.now();
     }
   },
 
@@ -482,9 +471,6 @@ Polymer({
         showPasswordsNotice && !showHistoryNotice;
     this.showPasswordsDeletionDialogLater_ =
         showPasswordsNotice && showHistoryNotice;
-    chrome.metricsPrivate.recordMediumTime(
-        'History.ClearBrowsingData.TimeSpentInDialog',
-        Date.now() - this.dialogOpenedTime_);
 
     // Close the clear browsing data or installed apps dialog if they are open.
     const isLastDialog = !showHistoryNotice && !showPasswordsNotice;

tools/metrics/histograms/histograms_xml/history/histograms.xml

@@ -317,6 +317,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram name="History.ClearBrowsingData.TimeSpentInDialog" units="ms"
     expires_after="M85">
+  <obsolete>
+    Removed 12/2020
+  </obsolete>
   <owner>dullweber@chromium.org</owner>
   <owner>msramek@chromium.org</owner>
   <summary>