Don't check chrome feature if native library is not loaded yet

Bug: 898834
Change-Id: I1194e4805e4504f4be120a1f89bdd99cb6bc34e7
Reviewed-on: https://chromium-review.googlesource.com/c/1324421Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Jian Li <jianli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606204}

chrome/android/java/src/org/chromium/chrome/browser/native_page/ContextMenuManager.java

@@ -188,7 +188,9 @@ public class ContextMenuManager implements OnCloseContextMenuListener {
                         R.string.contextmenu_open_in_other_window);
                 put(ContextMenuItemId.OPEN_IN_NEW_TAB, R.string.contextmenu_open_in_new_tab);
                 put(ContextMenuItemId.OPEN_IN_INCOGNITO_TAB,
-                        ChromeFeatureList.isEnabled(ChromeFeatureList.INCOGNITO_STRINGS)
+                        ChromeFeatureList.isInitialized()
+                                        && ChromeFeatureList.isEnabled(
+                                                   ChromeFeatureList.INCOGNITO_STRINGS)
                                 ? R.string.contextmenu_open_in_private_tab
                                 : R.string.contextmenu_open_in_incognito_tab);
                 put(ContextMenuItemId.SAVE_FOR_OFFLINE, R.string.contextmenu_save_link);