Use flow in all remaining tests (firefox-devtools#7828)

Author: bhackett1024

flow-typed/npm-custom/prettier.js

@@ -0,0 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+declare module "prettier" {
+  declare module.exports: any;
+}

src/actions/breakpoints/tests/__snapshots__/syncing.spec.js.snap

@@ -4,6 +4,7 @@ exports[`loading the debugger loads the initial breakpoint state 1`] = `
 Object {
   "breakpoint": Object {
     "astLocation": Object {
+      "index": 0,
       "name": undefined,
       "offset": Object {
         "line": 3,
@@ -45,6 +46,7 @@ exports[`loading the debugger loads the initial breakpoint state with a changed
 Object {
   "breakpoint": Object {
     "astLocation": Object {
+      "index": 0,
       "name": undefined,
       "offset": Object {
         "line": 3,
@@ -86,6 +88,7 @@ exports[`reloading debuggee syncs with changed source and an existing disabled B
 Object {
   "http://localhost:8000/examples/magic.js:3:": Object {
     "astLocation": Object {
+      "index": 0,
       "name": undefined,
       "offset": Object {
         "line": 3,
@@ -115,6 +118,7 @@ exports[`reloading debuggee syncs with unchanged source with an existing BP 1`]
 Object {
   "breakpoint": Object {
     "astLocation": Object {
+      "index": 0,
       "name": undefined,
       "offset": Object {
         "line": 3,
@@ -156,6 +160,7 @@ exports[`reloading debuggee updates a corresponding breakpoint for a changed sou
 Object {
   "breakpoint": Object {
     "astLocation": Object {
+      "index": 0,
       "name": undefined,
       "offset": Object {
         "line": 3,