Upgrade which / simplify use

Summary:
It's already a promise. With the next upgrade this otherwise causes
some nasty type errors due to overloading.

Reviewed By: jknoxville

Differential Revision: D18059641

fbshipit-source-id: 93cee95d7bbf767ff6276a0946262bf83587c728

package.json

@@ -114,7 +114,7 @@
     "@types/redux-devtools-extension": "^2.13.2",
     "@types/redux-mock-store": "^1.0.1",
     "@types/rsocket-tcp-server": "^0.0.2",
-    "@types/which": "^1.3.1",
+    "@types/which": "^1.3.2",
     "JSONStream": "^1.3.1",
     "adbkit": "^2.11.1",
     "adbkit-logcat": "^2.0.1",

src/chrome/DevicesButton.tsx

@@ -13,15 +13,12 @@ import {spawn} from 'child_process';
 import {dirname} from 'path';
 import {selectDevice, preferDevice} from '../reducers/connections';
 import {default as which} from 'which';
-import {promisify} from 'util';
 import {showOpenDialog} from '../utils/exportData';
 import PropTypes from 'prop-types';
 import BaseDevice from '../devices/BaseDevice';
 import React, {Component} from 'react';
 import {State} from '../reducers';
 
-const whichPromise = promisify(which);
-
 type StateFromProps = {
   selectedDevice: BaseDevice | null | undefined;
   androidEmulators: Array<string>;
@@ -48,7 +45,7 @@ class DevicesButton extends Component<Props> {
   launchEmulator = (name: string) => {
     // On Linux, you must run the emulator from the directory it's in because
     // reasons ...
-    whichPromise('emulator')
+    which('emulator')
       .then(emulatorPath => {
         if (emulatorPath) {
           const child = spawn(emulatorPath, [`@${name}`], {

yarn.lock

@@ -1460,10 +1460,10 @@
   dependencies:
     "@types/node" "*"
 
-"@types/which@^1.3.1":
-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/@types/which/-/which-1.3.1.tgz#7802c380887986ca909008afea4e08025b130f8d"
-  integrity sha512-ZrJDWpvg75LTGX4XwuneY9s6bF3OeZcGTpoGh3zDV9ytzcHMFsRrMIaLBRJZQMBoGyKs6unBQfVdrLZiYfb1zQ==
+"@types/which@^1.3.2":
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/@types/which/-/which-1.3.2.tgz#9c246fc0c93ded311c8512df2891fb41f6227fdf"
+  integrity sha512-8oDqyLC7eD4HM307boe2QWKyuzdzWBj56xI/imSl2cpL+U3tCMaTAkMJ4ee5JBZ/FsOJlvRGeIShiZDAl1qERA==
 
 "@types/yargs-parser@*":
   version "13.1.0"