[webcrypto] Remove unused ifdef now that blink has rolled.

content/child/webcrypto/webcrypto_impl.cc

Index: content/child/webcrypto/webcrypto_impl.cc
diff --git a/content/child/webcrypto/webcrypto_impl.cc b/content/child/webcrypto/webcrypto_impl.cc
index 563bb0c956246854db6002ecc845d78ec9fd8f8d..43b108bb0c66c8bc66dea7341af47ea9ecae1003 100644
--- a/content/child/webcrypto/webcrypto_impl.cc
+++ b/content/child/webcrypto/webcrypto_impl.cc
@@ -171,11 +171,7 @@ struct BaseState {
       : origin_thread(GetCurrentBlinkThread()), result(result) {}
 
   bool cancelled() {
-#ifdef WEBCRYPTO_RESULT_HAS_CANCELLED
     return result.cancelled();
-#else
-    return false;
-#endif
   }
 
   scoped_refptr<base::TaskRunner> origin_thread;