Update {virtual,override} to follow C++11 style in dbus.

dbus/mock_object_proxy.h

Index: dbus/mock_object_proxy.h
diff --git a/dbus/mock_object_proxy.h b/dbus/mock_object_proxy.h
index 7c61b47b42802272d40f6f8aadcb6487cd8e2349..66f485ad06ff31c6fa632edde692a5de6808fb41 100644
--- a/dbus/mock_object_proxy.h
+++ b/dbus/mock_object_proxy.h
@@ -29,7 +29,7 @@ class MockObjectProxy : public ObjectProxy {
                Response*(MethodCall* method_call,
                          int timeout_ms,
                          ScopedDBusError* error));
-  virtual scoped_ptr<Response> CallMethodAndBlockWithErrorDetails(
+  scoped_ptr<Response> CallMethodAndBlockWithErrorDetails(
       MethodCall* method_call,
       int timeout_ms,
       ScopedDBusError* error) override {
@@ -38,8 +38,8 @@ class MockObjectProxy : public ObjectProxy {
   }
   MOCK_METHOD2(MockCallMethodAndBlock, Response*(MethodCall* method_call,
                                                  int timeout_ms));
-  virtual scoped_ptr<Response> CallMethodAndBlock(MethodCall* method_call,
-                                                  int timeout_ms) override {
+  scoped_ptr<Response> CallMethodAndBlock(MethodCall* method_call,
+                                          int timeout_ms) override {
     return scoped_ptr<Response>(MockCallMethodAndBlock(method_call,
                                                        timeout_ms));
   }
@@ -58,7 +58,7 @@ class MockObjectProxy : public ObjectProxy {
   MOCK_METHOD0(Detach, void());
 
  protected:
-  virtual ~MockObjectProxy();
+  ~MockObjectProxy() override;
 };
 
 }  // namespace dbus