Warn on missing OVERRIDE/virtual everywhere, not just in header files.

chromeos/ime/component_extension_ime_manager_unittest.cc

Index: chromeos/ime/component_extension_ime_manager_unittest.cc
diff --git a/chromeos/ime/component_extension_ime_manager_unittest.cc b/chromeos/ime/component_extension_ime_manager_unittest.cc
index 5de1657ace77cd9e2a014ca4c2b7d328568d3371..f921ef0150c53d64aba515cc99663f064beb0275 100644
--- a/chromeos/ime/component_extension_ime_manager_unittest.cc
+++ b/chromeos/ime/component_extension_ime_manager_unittest.cc
@@ -28,7 +28,7 @@ class ComponentExtensionIMEManagerTest :
         on_initialized_callcount_(0) {
   }
 
-  void SetUp() {
+  virtual void SetUp() {
     ime_list_.clear();
 
     ComponentExtensionIME ext1;
@@ -129,7 +129,7 @@ class ComponentExtensionIMEManagerTest :
 
   }
 
-  void TearDown() {
+  virtual void TearDown() {
     EXPECT_EQ(1, on_initialized_callcount_);
     component_ext_mgr_->RemoveObserver(this);
   }
@@ -140,7 +140,7 @@ class ComponentExtensionIMEManagerTest :
   std::vector<ComponentExtensionIME> ime_list_;
 
  private:
-  void OnInitialized() {
+  virtual void OnInitialized() OVERRIDE {
     ++on_initialized_callcount_;
   }