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

test/cctest/test-threads.cc

Index: test/cctest/test-threads.cc
diff --git a/test/cctest/test-threads.cc b/test/cctest/test-threads.cc
index ffb29cdd25feb8f338c496f20b07c972df26ac56..5a010a8c9f1a5fa05b5dc5b56dc58cb540c9a43c 100644
--- a/test/cctest/test-threads.cc
+++ b/test/cctest/test-threads.cc
@@ -36,7 +36,7 @@
 TEST(Preemption) {
   v8::Locker locker(CcTest::default_isolate());
   v8::V8::Initialize();
-  v8::HandleScope scope;
+  v8::HandleScope scope(CcTest::default_isolate());
   v8::Context::Scope context_scope(v8::Context::New());
 
   v8::Locker::StartPreemption(100);
@@ -68,7 +68,7 @@ class ThreadA : public v8::internal::Thread {
   ThreadA() : Thread("ThreadA") { }
   void Run() {
     v8::Locker locker(CcTest::default_isolate());
-    v8::HandleScope scope;
+    v8::HandleScope scope(CcTest::default_isolate());
     v8::Context::Scope context_scope(v8::Context::New());
 
     CHECK_EQ(FILL_CACHE, turn);
@@ -107,7 +107,7 @@ class ThreadB : public v8::internal::Thread {
       {
         v8::Locker locker(CcTest::default_isolate());
         if (turn == CLEAN_CACHE) {
-          v8::HandleScope scope;
+          v8::HandleScope scope(CcTest::default_isolate());
           v8::Context::Scope context_scope(v8::Context::New());
 
           // Clear the caches by forcing major GC.