Use fragments setHasOptionsMenu

Remove complications by allowing android to handle fragment's
options menu.

See https://developer.android.com/guide/components/fragments.html#ActionBar

app/src/main/java/org/schabi/newpipe/MainActivity.java

@@ -52,8 +52,6 @@ public class MainActivity extends AppCompatActivity {
         MenuInflater inflater = getMenuInflater();
 
         inflater.inflate(R.menu.main_menu, menu);
-
-        mainFragment.onCreateOptionsMenu(menu, inflater);
         return true;
     }
 
@@ -79,8 +77,7 @@ public class MainActivity extends AppCompatActivity {
                 return true;
             }
             default:
-                return mainFragment.onOptionsItemSelected(item) ||
-                        super.onOptionsItemSelected(item);
+                return super.onOptionsItemSelected(item);
         }
     }
 }

app/src/main/java/org/schabi/newpipe/detail/VideoItemDetailActivity.java

@@ -162,19 +162,10 @@ public class VideoItemDetailActivity extends AppCompatActivity {
             NavUtils.navigateUpTo(this, intent);
             return true;
         } else {
-            return fragment.onOptionsItemSelected(item) ||
-                    super.onOptionsItemSelected(item);
+            return super.onOptionsItemSelected(item);
         }
     }
 
-    @Override
-    public boolean onCreateOptionsMenu(Menu menu) {
-        super.onCreateOptionsMenu(menu);
-        fragment.onCreateOptionsMenu(menu, getMenuInflater());
-        return true;
-    }
-
-
     /**
      * Retrieves all Strings which look remotely like URLs from a text.
      * Used if NewPipe was called through share menu.

app/src/main/java/org/schabi/newpipe/detail/VideoItemDetailFragment.java

@@ -629,6 +629,7 @@ public class VideoItemDetailFragment extends Fragment {
                 onNotSpecifiedContentError();
             }
         });
+        setHasOptionsMenu(true);
     }
 
     @Override

app/src/main/java/org/schabi/newpipe/download/DownloadActivity.java

@@ -273,8 +273,7 @@ public class DownloadActivity extends AppCompatActivity implements AdapterView.O
                 return true;
             }
             default:
-                return mFragment.onOptionsItemSelected(item) ||
-                        super.onOptionsItemSelected(item);
+                return super.onOptionsItemSelected(item);
         }
     }
 }

app/src/main/java/org/schabi/newpipe/search_fragment/SearchInfoItemFragment.java

@@ -160,6 +160,8 @@ public class SearchInfoItemFragment extends Fragment {
             }
         }
 
+        setHasOptionsMenu(true);
+
         SearchWorker sw = SearchWorker.getInstance();
         sw.setSearchWorkerResultListener(new SearchWorker.SearchWorkerResultListener() {
             @Override