Fix issue 738: make compilable with profilingsupport=off

src/heap-profiler.h

Index: src/heap-profiler.h
diff --git a/src/heap-profiler.h b/src/heap-profiler.h
index 28e240daf666c5703e73605ce625c7ebfba01fad..b593b992bb981ac8ae181f763f8ded0a9522bb5c 100644
--- a/src/heap-profiler.h
+++ b/src/heap-profiler.h
@@ -38,12 +38,16 @@ namespace internal {
 class HeapSnapshot;
 class HeapSnapshotsCollection;
 
+#endif
+
 // The HeapProfiler writes data to the log files, which can be postprocessed
 // to generate .hp files for use by the GHC/Valgrind tool hp2ps.
 class HeapProfiler {
  public:
   static void Setup();
   static void TearDown();
+
+#ifdef ENABLE_LOGGING_AND_PROFILING
   static HeapSnapshot* TakeSnapshot(const char* name);
   static HeapSnapshot* TakeSnapshot(String* name);
   static int GetSnapshotsCount();
@@ -68,9 +72,12 @@ class HeapProfiler {
   unsigned next_snapshot_uid_;
 
   static HeapProfiler* singleton_;
+#endif  // ENABLE_LOGGING_AND_PROFILING
 };
 
 
+#ifdef ENABLE_LOGGING_AND_PROFILING
+
 // JSObjectsCluster describes a group of JS objects that are
 // considered equivalent in terms of a particular profile.
 class JSObjectsCluster BASE_EMBEDDED {