Added a version of the v8::HandleScope constructor with an Isolate and use that consistently.

test/cctest/test-global-object.cc

Index: test/cctest/test-global-object.cc
diff --git a/test/cctest/test-global-object.cc b/test/cctest/test-global-object.cc
index 16c0be0eb95ee4a4fe5e42c2bcfa6760f0c8120e..b124b2728dfe102fb9654c25ea0103e810c874f6 100644
--- a/test/cctest/test-global-object.cc
+++ b/test/cctest/test-global-object.cc
@@ -34,7 +34,7 @@ using namespace v8;
 // This test fails if properties on the prototype of the global object appear
 // as declared globals.
 TEST(StrictUndeclaredGlobalVariable) {
-  HandleScope scope;
+  HandleScope scope(Isolate::GetCurrent());
   v8::Local<v8::String> var_name = v8_str("x");
   LocalContext context;
   v8::TryCatch try_catch;