Remove service worker concepts from apps/extensions manifest parsing.

extensions/common/manifest_constants.cc

Index: extensions/common/manifest_constants.cc
diff --git a/extensions/common/manifest_constants.cc b/extensions/common/manifest_constants.cc
index b2c9d991e5fad41870fcd1b8d1b4207711237ec4..9aa20fd3f0531c433bd9d2e528116607185566fc 100644
--- a/extensions/common/manifest_constants.cc
+++ b/extensions/common/manifest_constants.cc
@@ -113,8 +113,6 @@ const char kPlatformAppBackground[] = "app.background";
 const char kPlatformAppBackgroundPage[] = "app.background.page";
 const char kPlatformAppBackgroundScripts[] = "app.background.scripts";
 const char kPlatformAppContentSecurityPolicy[] = "app.content_security_policy";
-const char kPlatformAppServiceWorker[] = "app.service_worker";
-const char kPlatformAppServiceWorkerScript[] = "app.service_worker.script";
 const char kPlugins[] = "plugins";
 const char kPluginsPath[] = "path";
 const char kPluginsPublic[] = "public";
@@ -578,8 +576,6 @@ const char kInvalidSearchEngineMissingKeys[] =
     "'chrome_settings_overrides.search_provider'.";
 const char kInvalidSearchEngineURL[] =
     "Invalid URL [*] for 'chrome_settings_overrides.search_provider'.";
-const char kInvalidServiceWorkerScript[] =
-    "Invalid value for 'service_worker.script'.";
 const char kInvalidShortName[] =
     "Invalid value for 'short_name'.";
 const char kInvalidSignature[] =
@@ -722,9 +718,6 @@ const char kScriptBadgeIconIgnored[] =
 const char kScriptBadgeTitleIgnored[] =
     "default_title specified in script_badge manifest section will not be "
     "used.";
-const char kServiceWorkerRequiresFlag[] =
-    "Service worker features require "
-    "--enable-experimental-web-platform-features command-line flag.";
 const char kUnrecognizedManifestKey[] = "Unrecognized manifest key '*'.";
 const char kUnrecognizedManifestProperty[] =
     "Unrecognized property '*' of manifest key '*'.";