Build fix for Mac.

warning: base class 'class v8::OutputStream' should be explicitly initialized in the copy constructor

BUG=none
TEST=none
TBR=mnaganov

Review URL: https://chromiumcodereview.appspot.com/10038044

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11304 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/test-heap-profiler.cc

@@ -707,7 +707,8 @@ class TestStatsStream : public v8::OutputStream {
       intervals_count_(0),
       first_interval_index_(-1) { }
   TestStatsStream(const TestStatsStream& stream)
-    : eos_signaled_(stream.eos_signaled_),
+    : v8::OutputStream(stream),
+      eos_signaled_(stream.eos_signaled_),
       numbers_written_(stream.numbers_written_),
       entries_count_(stream.entries_count_),
       intervals_count_(stream.intervals_count_),