Fix a typo: LINUX -> OS_LINUX

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 25ae839f4a4ef9cba56eebb2b6318bbdc693b4b3..8d311f77bc8cfaeae0c82017abb6d8203da514f4 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -503,7 +503,7 @@ void RenderWidgetHostImpl::CopyFromBackingStore(
   if (view_ && is_accelerated_compositing_active_) {
     TRACE_EVENT0("browser",
         "RenderWidgetHostImpl::CopyFromBackingStore::FromCompositingSurface");
-#if defined(USE_AURA) || defined(LINUX)
+#if defined(USE_AURA) || defined(OS_LINUX)
     gfx::Rect copy_rect = src_subrect.IsEmpty() ?
         gfx::Rect(view_->GetViewBounds().size()) : src_subrect;
 #else