virtual/override specifier cleanup in ui/ (mostly Ozone code).

ui/ozone/platform/egltest/ozone_platform_egltest.cc

Index: ui/ozone/platform/egltest/ozone_platform_egltest.cc
diff --git a/ui/ozone/platform/egltest/ozone_platform_egltest.cc b/ui/ozone/platform/egltest/ozone_platform_egltest.cc
index 4403635476023c0478c925a4d7166b2304f02110..464e4ef0323cb9718fb791d10812d757b2e1bb20 100644
--- a/ui/ozone/platform/egltest/ozone_platform_egltest.cc
+++ b/ui/ozone/platform/egltest/ozone_platform_egltest.cc
@@ -200,7 +200,7 @@ class SurfaceOzoneEgltest : public SurfaceOzoneEGL {
       : eglplatform_shim_(eglplatform_shim) {
     native_window_ = eglplatform_shim_->ShimGetNativeWindow(window_id);
   }
-  ~SurfaceOzoneEgltest() {
+  ~SurfaceOzoneEgltest() override {
     bool ret = eglplatform_shim_->ShimReleaseNativeWindow(native_window_);
     DCHECK(ret);
   }
@@ -292,7 +292,7 @@ const int32* SurfaceFactoryEgltest::GetEGLSurfaceProperties(
 class OzonePlatformEgltest : public OzonePlatform {
  public:
   OzonePlatformEgltest() : shim_initialized_(false) {}
-  virtual ~OzonePlatformEgltest() {
+  ~OzonePlatformEgltest() override {
     if (shim_initialized_)
       eglplatform_shim_.ShimTerminate();
   }