Revert "feat: define global for enabling Performance (#159)"

This reverts commit cbb8c83.

Author: hoxyq

front_end/global_typings/react_native.d.ts

@@ -12,6 +12,5 @@ declare global {
     var enableReactNativeOpenInExternalEditor: boolean|undefined;
     var reactNativeOpenInEditorButtonImage: string|undefined;
     var FB_ONLY__reactNativeFeedbackLink: string|undefined;
-    var FB_ONLY__enablePerformance: any;
   }
 }

front_end/panels/timeline/timeline-meta.ts

@@ -87,7 +87,7 @@ UI.ViewManager.registerViewExtension({
   title: i18nLazyString(UIStrings.performance),
   commandPrompt: i18nLazyString(UIStrings.showPerformance),
   order: 50,
-  experiment: globalThis.FB_ONLY__enablePerformance === true ? undefined : Root.Runtime.ExperimentName.ENABLE_PERFORMANCE_PANEL,
+  experiment: Root.Runtime.ExperimentName.ENABLE_PERFORMANCE_PANEL,
   async loadView() {
     const Timeline = await loadTimelineModule();
     return Timeline.TimelinePanel.TimelinePanel.instance();