Update web_driver.dart
Update web_driver.dart

remove => for void functions that call another function with return value. If the called function actually returns something this fails with "Caught type '_LinkedHashMap' is not a subtype of type 'void' of 'function result'." because the void function cannot return what the called function returned.
google/dart-sync-webdriver,google/dart-sync-webdriver,google/dart-sync-webdriver