1 files changed, 2 insertions, 0 deletions
diff --git a/base/threading/thread_restrictions.h b/base/threading/thread_restrictions.h
index 8a494a8..d004343 100644
--- a/base/threading/thread_restrictions.h
+++ b/base/threading/thread_restrictions.h
@@ -9,6 +9,7 @@
 #include "base/basictypes.h"
 
 class BrowserProcessImpl;
+class HistogramSynchronizer;
 class MetricsService;
 class NativeBackendKWallet;
 class RenderWidgetHelper;
@@ -148,6 +149,7 @@ class BASE_EXPORT ThreadRestrictions {
  private:
   // DO NOT ADD ANY OTHER FRIEND STATEMENTS, talk to jam or brettw first.
   // BEGIN ALLOWED USAGE.
+  friend class ::HistogramSynchronizer;
   friend class ::RenderWidgetHelper;     
   friend class ::TestingAutomationProvider;
   friend class SequencedWorkerPool;