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

content/test/content_test_suite.cc

Index: content/test/content_test_suite.cc
diff --git a/content/test/content_test_suite.cc b/content/test/content_test_suite.cc
index 18a116f3e0a42765c0c6a45baf09074e30cea38e..42cb92b367dfc832108ee999c43187c4ed95194d 100644
--- a/content/test/content_test_suite.cc
+++ b/content/test/content_test_suite.cc
@@ -52,12 +52,12 @@ class TestInitializationListener : public testing::EmptyTestEventListener {
   TestInitializationListener() : test_content_client_initializer_(NULL) {
   }
 
-  virtual void OnTestStart(const testing::TestInfo& test_info) override {
+  void OnTestStart(const testing::TestInfo& test_info) override {
     test_content_client_initializer_ =
         new content::TestContentClientInitializer();
   }
 
-  virtual void OnTestEnd(const testing::TestInfo& test_info) override {
+  void OnTestEnd(const testing::TestInfo& test_info) override {
     delete test_content_client_initializer_;
   }