Backport changes made in mozilla-central for Bug 1382581 (#5705)

Author: nchevobbe

.travis.yml

@@ -10,7 +10,7 @@ env:
   global:
     - DISPLAY=':99.0'
     - YARN_VERSION='0.24.5'
-    - MC_COMMIT='00ef5405cd7e' # https://hg.mozilla.org/mozilla-central/shortlog
+    - MC_COMMIT='97160a734959' # https://hg.mozilla.org/mozilla-central/shortlog
 
 notifications:
   slack:

src/actions/navigation.js

@@ -32,7 +32,7 @@ import type { ThunkArgs } from "./types";
  * @memberof actions/navigation
  * @static
  */
-export function willNavigate(_: any, event: Object) {
+export function willNavigate(event: Object) {
   return async function({ dispatch, getState, client, sourceMaps }: ThunkArgs) {
     await sourceMaps.clearSourceMaps();
     clearWasmStates();

src/test/mochitest/browser_dbg-chrome-create.js

@@ -24,7 +24,7 @@ let gProcess = undefined;
 function initChromeDebugger() {
   info("Initializing a chrome debugger process.");
   return new Promise(resolve => {
-    BrowserToolboxProcess.init(onClose, (event, _process) => {
+    BrowserToolboxProcess.init(onClose, _process => {
       info("Browser toolbox process started successfully.");
       resolve(_process);
     });