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

test/cctest/test-symbols.cc

Index: test/cctest/test-symbols.cc
diff --git a/test/cctest/test-symbols.cc b/test/cctest/test-symbols.cc
index adc100d72376455fa1eb24a913df29194eab8848..e9534574255dc00517c7764b11bb6aca4b87f5f8 100644
--- a/test/cctest/test-symbols.cc
+++ b/test/cctest/test-symbols.cc
@@ -16,12 +16,10 @@ static v8::Persistent<v8::Context> env;
 
 static void InitializeVM() {
   if (env.IsEmpty()) {
-    v8::HandleScope scope;
     const char* extensions[] = { "v8/print" };
     v8::ExtensionConfiguration config(1, extensions);
     env = v8::Context::New(&config);
   }
-  v8::HandleScope scope;
   env->Enter();
 }