Fix missing crx file support
Fix missing crx file support

guozanhua/chrome-app-developer-tool,feedhenry/cordova-app-harness,apache/cordova-app-harness,feedhenry/cordova-app-harness,guozanhua/chrome-app-developer-tool,feedhenry/cordova-app-harness,guozanhua/chrome-app-developer-tool,apache/cordova-app-harness,apache/cordova-app-harness,feedhenry/cordova-app-harness,apache/cordova-app-harness,guozanhua/chrome-app-developer-tool