Android settings: conditionally show notification vibrate option

chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SingleCategoryPreferences.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SingleCategoryPreferences.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SingleCategoryPreferences.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SingleCategoryPreferences.java
index 9350e99b72631ca5b0daf01f9a8c74549a6beab4..08a731a750a337a3c6b450d7e4fc6a9e738e056e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SingleCategoryPreferences.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SingleCategoryPreferences.java
@@ -28,6 +28,7 @@ import android.widget.Button;
 import android.widget.ListView;
 import android.widget.TextView;
 
+import org.chromium.base.BuildInfo;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.help.HelpAndFeedback;
@@ -609,7 +610,7 @@ public class SingleCategoryPreferences extends PreferenceFragment
         // Configure/hide the notifications vibrate toggle, as needed.
         Preference notificationsVibrate =
                 getPreferenceScreen().findPreference(NOTIFICATIONS_VIBRATE_TOGGLE_KEY);
-        if (mCategory.showNotificationsSites()) {
+        if (mCategory.showNotificationsSites() && !BuildInfo.isAtLeastO()) {
             notificationsVibrate.setOnPreferenceChangeListener(this);
             updateNotificationsVibrateCheckBox();
         } else {
@@ -727,7 +728,9 @@ public class SingleCategoryPreferences extends PreferenceFragment
         ChromeBaseCheckBoxPreference preference =
                 (ChromeBaseCheckBoxPreference) getPreferenceScreen().findPreference(
                         NOTIFICATIONS_VIBRATE_TOGGLE_KEY);
-        preference.setEnabled(PrefServiceBridge.getInstance().isNotificationsEnabled());
+        if (preference != null) {
+            preference.setEnabled(PrefServiceBridge.getInstance().isNotificationsEnabled());
+        }
     }
 
     private void showManagedToast() {