RefCounted types should not have public destructors, Linux fixes

chrome/browser/jankometer.cc

Index: chrome/browser/jankometer.cc
diff --git a/chrome/browser/jankometer.cc b/chrome/browser/jankometer.cc
index df1355b899321ab188fe68bbbe720c4466ce71b6..3884867b07cad28e35a72e1743552d67400a3dbe 100644
--- a/chrome/browser/jankometer.cc
+++ b/chrome/browser/jankometer.cc
@@ -221,8 +221,6 @@ class IOJankObserver : public base::RefCountedThreadSafe<IOJankObserver>,
                  bool watchdog_enable)
       : helper_(thread_name, excessive_duration, watchdog_enable) {}
 
-  ~IOJankObserver() {}
-
   // Attaches the observer to the current thread's message loop. You can only
   // attach to the current thread, so this function can be invoked on another
   // thread to attach it.
@@ -262,6 +260,8 @@ class IOJankObserver : public base::RefCountedThreadSafe<IOJankObserver>,
  private:
   friend class base::RefCountedThreadSafe<IOJankObserver>;
 
+  ~IOJankObserver() {}
+
   JankObserverHelper helper_;
 
   DISALLOW_COPY_AND_ASSIGN(IOJankObserver);