Remove v8::i::Isolate::Current from cctests

test/cctest/test-code-stubs-mips.cc

Index: test/cctest/test-code-stubs-mips.cc
diff --git a/test/cctest/test-code-stubs-mips.cc b/test/cctest/test-code-stubs-mips.cc
index 19ef691e34431dd9b098fc316ecb91de48808dba..f1f1c01d749a224b7879925553194d73e18ce55f 100644
--- a/test/cctest/test-code-stubs-mips.cc
+++ b/test/cctest/test-code-stubs-mips.cc
@@ -159,8 +159,9 @@ static Isolate* GetIsolateFrom(LocalContext* context) {
 int32_t RunGeneratedCodeCallWrapper(ConvertDToIFunc func,
                                     double from) {
 #ifdef USE_SIMULATOR
-  Simulator::current(Isolate::Current())->CallFP(FUNCTION_ADDR(func), from, 0.);
-  return Simulator::current(Isolate::Current())->get_register(v0.code());
+  Simulator::current(CcTest::i_isolate())
+      ->CallFP(FUNCTION_ADDR(func), from, 0.);
+  return Simulator::current(CcTest::i_isolate())->get_register(v0.code());
 #else
   return (*func)(from);
 #endif