Bug 1554162 - Enable ESLint for startupcache/. r=froydnj

Depends on D32493

Differential Revision: https://phabricator.services.mozilla.com/D32494

--HG--
rename : startupcache/test/browser.ini => startupcache/test/browser/browser.ini
rename : startupcache/test/browser_startupcache_telemetry.js => startupcache/test/browser/browser_startupcache_telemetry.js
extra : moz-landing-system : lando

.eslintignore

@@ -19,7 +19,6 @@ netwerk/cookie/test/browser/**
 netwerk/test/browser/**
 netwerk/test/mochitests/**
 netwerk/test/unit*/**
-startupcache/**
 
 # We currently have no js files in these directories, so we ignore them by
 # default to aid ESLint's performance.

startupcache/moz.build

@@ -8,7 +8,7 @@ with Files("**"):
     BUG_COMPONENT = ("Core", "XPCOM")
 
 TEST_DIRS += ['test']
-BROWSER_CHROME_MANIFESTS += ['test/browser.ini']
+BROWSER_CHROME_MANIFESTS += ['test/browser/browser.ini']
 
 EXPORTS.mozilla.scache += [
     'StartupCache.h',