Enable Clang warnings for implementation files on all platforms.

chrome/browser/ui/android/tab_model/tab_model_unittest.cc

Index: chrome/browser/ui/android/tab_model/tab_model_unittest.cc
diff --git a/chrome/browser/ui/android/tab_model/tab_model_unittest.cc b/chrome/browser/ui/android/tab_model/tab_model_unittest.cc
index b6395584a8b9b20770c444da35deb0e3070d734f..439b2bc5fb4f5d1c37e8ca0515d52c33f91fce57 100644
--- a/chrome/browser/ui/android/tab_model/tab_model_unittest.cc
+++ b/chrome/browser/ui/android/tab_model/tab_model_unittest.cc
@@ -28,15 +28,15 @@ class TestTabModel : public TabModel {
   explicit TestTabModel(Profile* profile)
     : TabModel(profile) {}
 
-  int GetTabCount() const OVERRIDE { return 0; }
-  int GetActiveIndex() const OVERRIDE { return 0; }
-  content::WebContents* GetWebContentsAt(int index) const OVERRIDE {
+  virtual int GetTabCount() const OVERRIDE { return 0; }
+  virtual int GetActiveIndex() const OVERRIDE { return 0; }
+  virtual content::WebContents* GetWebContentsAt(int index) const OVERRIDE {
     return NULL;
   }
-  SessionID::id_type GetTabIdAt(int index) const OVERRIDE { return 0; }
-  void CreateTab(content::WebContents* web_contents) OVERRIDE {}
-  bool IsSessionRestoreInProgress() const OVERRIDE { return false; }
-  void OpenClearBrowsingData() const OVERRIDE {}
+  virtual SessionID::id_type GetTabIdAt(int index) const OVERRIDE { return 0; }
+  virtual void CreateTab(content::WebContents* web_contents) OVERRIDE {}
+  virtual bool IsSessionRestoreInProgress() const OVERRIDE { return false; }
+  virtual void OpenClearBrowsingData() const OVERRIDE {}
 };
 
 TEST_F(TabModelTest, TestProfileHandling) {