replace OVERRIDE and FINAL with override and final in base/

base/files/memory_mapped_file_unittest.cc

Index: base/files/memory_mapped_file_unittest.cc
diff --git a/base/files/memory_mapped_file_unittest.cc b/base/files/memory_mapped_file_unittest.cc
index 6627d4044287d0f81ddab3cb9b0389399e43da74..36999bfba92a2623c0631285c60d5321c124d73d 100644
--- a/base/files/memory_mapped_file_unittest.cc
+++ b/base/files/memory_mapped_file_unittest.cc
@@ -29,7 +29,7 @@ bool CheckBufferContents(const uint8* data, size_t size, size_t offset) {
 
 class MemoryMappedFileTest : public PlatformTest {
  protected:
-  virtual void SetUp() OVERRIDE {
+  virtual void SetUp() override {
     PlatformTest::SetUp();
     CreateTemporaryFile(&temp_file_path_);
   }