Mojo: Convert OVERRIDE -> override in various subdirectories of mojo/.

mojo/common/test/test_support_impl.h

Index: mojo/common/test/test_support_impl.h
diff --git a/mojo/common/test/test_support_impl.h b/mojo/common/test/test_support_impl.h
index c752b579ba9bf7723e4e34883ee8a5c154df739b..9f69bfe49b407fa7b12f293da7b65e3ac3deec73 100644
--- a/mojo/common/test/test_support_impl.h
+++ b/mojo/common/test/test_support_impl.h
@@ -18,10 +18,10 @@ class TestSupportImpl : public TestSupport {
 
   virtual void LogPerfResult(const char* test_name,
                              double value,
-                             const char* units) OVERRIDE;
-  virtual FILE* OpenSourceRootRelativeFile(const char* relative_path) OVERRIDE;
+                             const char* units) override;
+  virtual FILE* OpenSourceRootRelativeFile(const char* relative_path) override;
   virtual char** EnumerateSourceRootRelativeDirectory(const char* relative_path)
-      OVERRIDE;
+      override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestSupportImpl);