Objects that derive from RefCounted/RefCountedThreadSafe should not have public dtors.

base/message_pump_mac.mm

Index: base/message_pump_mac.mm
diff --git a/base/message_pump_mac.mm b/base/message_pump_mac.mm
index 0e12b74b56b9a04bc81617720c7bc0cea1b55dc3..87c48c8ef407f3c100bf1baf768a3d1e43b5a2fd 100644
--- a/base/message_pump_mac.mm
+++ b/base/message_pump_mac.mm
@@ -460,6 +460,8 @@ MessagePumpCFRunLoop::MessagePumpCFRunLoop()
     : quit_pending_(false) {
 }
 
+MessagePumpCFRunLoop::~MessagePumpCFRunLoop() {}
+
 // Called by MessagePumpCFRunLoopBase::DoRun.  If other CFRunLoopRun loops were
 // running lower on the run loop thread's stack when this object was created,
 // the same number of CFRunLoopRun loops must be running for the outermost call
@@ -542,6 +544,8 @@ MessagePumpNSApplication::MessagePumpNSApplication()
       running_own_loop_(false) {
 }
 
+MessagePumpNSApplication::~MessagePumpNSApplication() {}
+
 void MessagePumpNSApplication::DoRun(Delegate* delegate) {
   bool last_running_own_loop_ = running_own_loop_;