[Android, Settings] Fix NPE when both media related site settings are enabled

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

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SiteSettingsPreferences.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SiteSettingsPreferences.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SiteSettingsPreferences.java
index 14b32f48a9536addf1107d1bc300843a9290a7a7..7dcf761e3a42a3b938f64322d4561389f005fbe3 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SiteSettingsPreferences.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SiteSettingsPreferences.java
@@ -158,7 +158,7 @@ public class SiteSettingsPreferences extends PreferenceFragment
             // When showing the main menu, only one of these two will be visible, at most.
             if (mProtectedContentMenuAvailable && !mAutoplayMenuAvailable) {
                 websitePrefs.add(PROTECTED_CONTENT_KEY);
-            } else if (mAutoplayMenuAvailable) {
+            } else if (mAutoplayMenuAvailable && !mProtectedContentMenuAvailable) {
                 websitePrefs.add(AUTOPLAY_KEY);
             }
             websitePrefs.add(BACKGROUND_SYNC_KEY);