Unify UpperWing and LowerWing tree-view components into WingTreeView.

Author: mstange

src/components/calltree/ProfileFunctionListView.tsx

@@ -7,8 +7,7 @@ import * as React from 'react';
 import explicitConnect from 'firefox-profiler/utils/connect';
 import { FunctionList } from './FunctionList';
 import { SelfWing } from './SelfWing';
-import { UpperWing } from './UpperWing';
-import { LowerWing } from './LowerWing';
+import { UpperWing, LowerWing } from './WingTreeView';
 import { DisclosureBox } from 'firefox-profiler/components/shared/DisclosureBox';
 import { WingViewToggle } from './WingViewToggle';
 import { StackSettings } from 'firefox-profiler/components/shared/StackSettings';