[duet] Remove the on/off homepage toggle in homepage setting page

Bug: 1011008
Change-Id: I23bb5b2b8eedac31923b043fd651b4ecbdc4156f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866971Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Gang Wu <gangwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707654}

chrome/android/java/src/org/chromium/chrome/browser/preferences/HomepagePreferences.java

@@ -11,6 +11,7 @@ import android.support.v7.preference.PreferenceFragmentCompat;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.partnercustomizations.HomepageManager;
+import org.chromium.chrome.browser.util.FeatureUtilities;
 
 /**
  * Fragment that allows the user to configure homepage related preferences.
@@ -30,14 +31,19 @@ public class HomepagePreferences extends PreferenceFragmentCompat {
         getActivity().setTitle(R.string.options_homepage_title);
         PreferenceUtils.addPreferencesFromResource(this, R.xml.homepage_preferences);
 
-        ChromeSwitchPreference mHomepageSwitch =
+        ChromeSwitchPreference homepageSwitch =
                 (ChromeSwitchPreference) findPreference(PREF_HOMEPAGE_SWITCH);
+
+        if (FeatureUtilities.isBottomToolbarEnabled()) {
+            homepageSwitch.setVisible(false);
+        } else {
             boolean isHomepageEnabled = mHomepageManager.getPrefHomepageEnabled();
-        mHomepageSwitch.setChecked(isHomepageEnabled);
-        mHomepageSwitch.setOnPreferenceChangeListener((preference, newValue) -> {
+            homepageSwitch.setChecked(isHomepageEnabled);
+            homepageSwitch.setOnPreferenceChangeListener((preference, newValue) -> {
                 mHomepageManager.setPrefHomepageEnabled((boolean) newValue);
                 return true;
             });
+        }
 
         mHomepageEdit = findPreference(PREF_HOMEPAGE_EDIT);
         updateCurrentHomepageUrl();