Pass gfx structs by const ref (gfx::Vector2d/F)

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
index b53fc7f650ce8b7672395746d8892c74a61ff4ee..a5e41d9089928ab5e14ca3f34ecdbc16661f8669 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
@@ -57,7 +57,7 @@ gfx::Size GetExpandedWindowSize(DWORD window_style, gfx::Size size) {
   return expanded;
 }
 
-void InsetBottomRight(gfx::Rect* rect, gfx::Vector2d vector) {
+void InsetBottomRight(gfx::Rect* rect, const gfx::Vector2d& vector) {
   rect->Inset(0, 0, vector.x(), vector.y());
 }