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

BUG=375430
TBR=rsleevi

Review URL: https://codereview.chromium.org/345213002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278818 0039d316-1c4b-4281-b951-d872f2087c98

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;