Made MessagePump a non-thread safe class.

base/test/test_support_android.cc

Index: base/test/test_support_android.cc
diff --git a/base/test/test_support_android.cc b/base/test/test_support_android.cc
index e0443227411127d455c7dc65d8cccbf1279b72dc..1ad4c2b0db035c642c459cbbab4e90f5aa606369 100644
--- a/base/test/test_support_android.cc
+++ b/base/test/test_support_android.cc
@@ -72,6 +72,8 @@ class Waitable {
 
 // The MessagePumpForUI implementation for test purpose.
 class MessagePumpForUIStub : public base::MessagePumpForUI {
+  virtual ~MessagePumpForUIStub() {}
+
   virtual void Start(base::MessagePump::Delegate* delegate) OVERRIDE {
     NOTREACHED() << "The Start() method shouldn't be called in test, using"
         " Run() method should be used.";
@@ -129,9 +131,6 @@ class MessagePumpForUIStub : public base::MessagePumpForUI {
       const base::TimeTicks& delayed_work_time) OVERRIDE {
     Waitable::GetInstance()->Signal();
   }
-
- protected:
-  virtual ~MessagePumpForUIStub() {}
 };
 
 base::MessagePump* CreateMessagePumpForUIStub() {