Add virtual and OVERRIDE to base/ implementation files

BUG=none
TEST=compiles


Review URL: http://codereview.chromium.org/10004001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@131098 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 441061813c0a5c13392fa1ceff763639cccf3233
diff --git a/base/file_path_unittest.cc b/base/file_path_unittest.cc
index 49fd1e0..71bff29 100644
--- a/base/file_path_unittest.cc
+++ b/base/file_path_unittest.cc
@@ -46,10 +46,10 @@
 // to be a PlatformTest
 class FilePathTest : public PlatformTest {
  protected:
-  virtual void SetUp() {
+  virtual void SetUp() OVERRIDE {
     PlatformTest::SetUp();
   }
-  virtual void TearDown() {
+  virtual void TearDown() OVERRIDE {
     PlatformTest::TearDown();
   }
 };