Fixed a few lifetime/ownership issues in cctest/test-api.

test/cctest/cctest.h

Index: test/cctest/cctest.h
diff --git a/test/cctest/cctest.h b/test/cctest/cctest.h
index 6d2c552ac6ca5ef8786b7a11234343cdfc35d3b8..6c67dd52ec4094d7e6805266879e1d92b3f20cfb 100644
--- a/test/cctest/cctest.h
+++ b/test/cctest/cctest.h
@@ -130,6 +130,11 @@ class CcTest {
       CcTestExtensionFlags extensions,
       v8::Isolate* isolate = CcTest::isolate());
 
+  static void TearDown() {
+    // TODO(svenpanne) Enable this when our cctests are fixed.
+    // if (isolate_ != NULL) isolate_->Dispose();
+  }
+
  private:
   friend int main(int argc, char** argv);
   TestFunction* callback_;