Delete the last remaining use of OVERRIDE and remove its definition.

chrome/browser/predictors/resource_prefetch_common_unittest.cc

Index: chrome/browser/predictors/resource_prefetch_common_unittest.cc
diff --git a/chrome/browser/predictors/resource_prefetch_common_unittest.cc b/chrome/browser/predictors/resource_prefetch_common_unittest.cc
index 74033fb803d2dd157865c9454a54b6b7d4fc75c9..61089d6168129846ef8c671f509c871f0de10c0c 100644
--- a/chrome/browser/predictors/resource_prefetch_common_unittest.cc
+++ b/chrome/browser/predictors/resource_prefetch_common_unittest.cc
@@ -27,14 +27,14 @@ namespace {
 
 class MockNetworkChangeNotifierWIFI : public NetworkChangeNotifier {
  public:
-  ConnectionType GetCurrentConnectionType() const OVERRIDE {
+  ConnectionType GetCurrentConnectionType() const override {
     return NetworkChangeNotifier::CONNECTION_WIFI;
   }
 };
 
 class MockNetworkChangeNotifier4G : public NetworkChangeNotifier {
  public:
-  ConnectionType GetCurrentConnectionType() const OVERRIDE {
+  ConnectionType GetCurrentConnectionType() const override {
     return NetworkChangeNotifier::CONNECTION_4G;
   }
 };
@@ -46,7 +46,7 @@ namespace predictors {
 class ResourcePrefetchCommonTest : public testing::Test {
  public:
   ResourcePrefetchCommonTest();
-  virtual void SetUp() OVERRIDE;
+  void SetUp() override;
 
   void CreateTestFieldTrial(const std::string& name,
                             const std::string& group_name) {