Delete stale 'using' statement (#203)

Author: gahaas

src/crypto/crypto_timing.cc

@@ -11,7 +11,6 @@
 namespace node {
 
 using v8::FastApiCallbackOptions;
-using v8::FastApiTypedArray;
 using v8::FunctionCallbackInfo;
 using v8::HandleScope;
 using v8::Local;