Remove IOSDevice.buffer, IOSDevice.log

Summary: It's unused, can only assume that it was a log buffer in some distant time which is now hidden behind a separate log listener class

Reviewed By: passy

Differential Revision: D34787086

fbshipit-source-id: 0f920649c119efc5172ca7dcc6b53cfb802a5cbf

desktop/flipper-server-core/src/devices/ios/IOSDevice.tsx

@@ -8,7 +8,7 @@
  */
 
 import {DeviceType, timeout} from 'flipper-common';
-import child_process, {ChildProcess} from 'child_process';
+import {ChildProcess} from 'child_process';
 import {IOSBridge} from './IOSBridge';
 import {ServerDevice} from '../ServerDevice';
 import {FlipperServerImpl} from '../../FlipperServerImpl';
@@ -16,8 +16,6 @@ import {iOSCrashWatcher} from './iOSCrashUtils';
 import {iOSLogListener} from './iOSLogListener';
 
 export default class IOSDevice extends ServerDevice {
-  log?: child_process.ChildProcessWithoutNullStreams;
-  buffer: string;
   private recording?: {process: ChildProcess; destination: string};
   private iOSBridge: IOSBridge;
   readonly logListener: iOSLogListener;
@@ -41,7 +39,6 @@ export default class IOSDevice extends ServerDevice {
         screenshotAvailable: true,
       },
     });
-    this.buffer = '';
     this.iOSBridge = iOSBridge;
 
     this.logListener = new iOSLogListener(