Coverity: Fixing pass by value bugs

ui/gfx/render_text.h

Index: ui/gfx/render_text.h
diff --git a/ui/gfx/render_text.h b/ui/gfx/render_text.h
index 9f13be454cf9da9948baca8c346335a0bbaaa25d..ac265f7c718ac14940036e6e8fca5e537bad1bc1 100644
--- a/ui/gfx/render_text.h
+++ b/ui/gfx/render_text.h
@@ -126,7 +126,7 @@ class UI_EXPORT RenderText {
   void set_focused(bool focused) { focused_ = focused; }
 
   const StyleRange& default_style() const { return default_style_; }
-  void set_default_style(StyleRange style) { default_style_ = style; }
+  void set_default_style(const StyleRange& style) { default_style_ = style; }
 
   const Rect& display_rect() const { return display_rect_; }
   void SetDisplayRect(const Rect& r);