Change all plugin uses of client.send to client.call

Summary: client.send will be deprecated because it doesn't allow handling or detection of errors.

Reviewed By: passy

Differential Revision: D14084786

fbshipit-source-id: 7ebe4a7f3f8536c705e1c9302f38db0a34d99dc4

src/plugins/leak_canary/index.js

@@ -88,7 +88,7 @@ export default class LeakCanary extends FlipperPlugin<State> {
       selectedIdx: null,
       selectedEid: null,
     });
-    this.client.send('clear');
+    this.client.call('clear');
   };
 
   _selectElement = (leakIdx: number, eid: string) => {