Fix X11DesktopHandler::ActivateWindow on Unity for known user gestures

content/browser/renderer_host/render_view_host_delegate.cc

Index: content/browser/renderer_host/render_view_host_delegate.cc
diff --git a/content/browser/renderer_host/render_view_host_delegate.cc b/content/browser/renderer_host/render_view_host_delegate.cc
index 0b109911dddabaf7b364ab4b6e4a959ee6c3afce..c244ea4c5cc1ac81cc2a6240e40993484730262d 100644
--- a/content/browser/renderer_host/render_view_host_delegate.cc
+++ b/content/browser/renderer_host/render_view_host_delegate.cc
@@ -22,6 +22,10 @@ WebContents* RenderViewHostDelegate::GetAsWebContents() {
   return NULL;
 }
 
+void RenderViewHostDelegate::ActivateForUserGesture() {
+  Activate();
+}
+
 bool RenderViewHostDelegate::IsFullscreenForCurrentTab() const {
   return false;
 }