Make unittests work in component build

src/heap/scavenge-job.h

Index: src/heap/scavenge-job.h
diff --git a/src/heap/scavenge-job.h b/src/heap/scavenge-job.h
index fadfccdcc4ea00503b38c0b39ba3af394f65984a..f7fbfc148022027a1ea6132ec96f54f65ece61e8 100644
--- a/src/heap/scavenge-job.h
+++ b/src/heap/scavenge-job.h
@@ -6,6 +6,7 @@
 #define V8_HEAP_SCAVENGE_JOB_H_
 
 #include "src/cancelable-task.h"
+#include "src/globals.h"
 #include "src/heap/gc-tracer.h"
 
 namespace v8 {
@@ -16,7 +17,7 @@ class Isolate;
 
 
 // This class posts idle tasks and performs scavenges in the idle tasks.
-class ScavengeJob {
+class V8_EXPORT_PRIVATE ScavengeJob {
  public:
   class IdleTask : public CancelableIdleTask {
    public: