Removed unnecessary checks.
Removed unnecessary checks.

By default, on Android, if a "system" webview type is specified, then we use the system webview; anything else and we use Crosswalk.

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