Replace OVERRIDE->override and FINAL->final since we now require C++11.

test/unittests/base/platform/platform-unittest.cc

Index: test/unittests/base/platform/platform-unittest.cc
diff --git a/test/unittests/base/platform/platform-unittest.cc b/test/unittests/base/platform/platform-unittest.cc
index 8392b55462446cc13cf09546b5e6cf84743f8f66..0f0fb375b1a7e240032f621b436ccacc4232bbe0 100644
--- a/test/unittests/base/platform/platform-unittest.cc
+++ b/test/unittests/base/platform/platform-unittest.cc
@@ -49,7 +49,7 @@ class ThreadLocalStorageTest : public Thread, public ::testing::Test {
     }
   }
 
-  void Run() FINAL {
+  void Run() final {
     for (size_t i = 0; i < arraysize(keys_); i++) {
       CHECK(!Thread::HasThreadLocal(keys_[i]));
     }