Partial revert of https://codereview.chromium.org/1911973002/

content/child/webthemeengine_impl_default.h

Index: content/child/webthemeengine_impl_default.h
diff --git a/content/child/webthemeengine_impl_default.h b/content/child/webthemeengine_impl_default.h
index e4e1c7eaddc2f167e028aeab3ecfdbde5c65c4f9..36ddb6bf7f569f0b8b67eeea0580f7b9b12d0834 100644
--- a/content/child/webthemeengine_impl_default.h
+++ b/content/child/webthemeengine_impl_default.h
@@ -27,6 +27,15 @@ class WebThemeEngineImpl : public blink::WebThemeEngine {
                                     blink::WebThemeEngine::State endState,
                                     double progress,
                                     const blink::WebRect& rect);
+#if defined(OS_WIN)
+  // Caches the scrollbar metrics. These are retrieved in the browser and passed
+  // to the renderer in RendererPreferences because the required Windows system
+  // calls cannot be made in sandboxed renderers.
+  static void cacheScrollBarMetrics(int32_t vertical_scroll_bar_width,
+                                    int32_t horizontal_scroll_bar_height,
+                                    int32_t vertical_arrow_bitmap_height,
+                                    int32_t horizontal_arrow_bitmap_width);
+#endif
 };
 
 }  // namespace content