change more OVERRIDE instances to override in gin/

gin/public/v8_platform.h

Index: gin/public/v8_platform.h
diff --git a/gin/public/v8_platform.h b/gin/public/v8_platform.h
index f085b58ecfbfd3c403e33c7143118733f831c914..59e21479f53d12c49d892868b6f8d7334768c08d 100644
--- a/gin/public/v8_platform.h
+++ b/gin/public/v8_platform.h
@@ -21,10 +21,10 @@ class GIN_EXPORT V8Platform : public NON_EXPORTED_BASE(v8::Platform) {
   // v8::Platform implementation.
   virtual void CallOnBackgroundThread(
       v8::Task* task,
-      v8::Platform::ExpectedRuntime expected_runtime) OVERRIDE;
+      v8::Platform::ExpectedRuntime expected_runtime) override;
   virtual void CallOnForegroundThread(v8::Isolate* isolate,
-                                      v8::Task* task) OVERRIDE;
-  virtual double MonotonicallyIncreasingTime() OVERRIDE;
+                                      v8::Task* task) override;
+  virtual double MonotonicallyIncreasingTime() override;
  private:
   friend struct base::DefaultLazyInstanceTraits<V8Platform>;