Widget::ShouldUseNativeFrame is now meaningful on Linux.

chrome/browser/ui/views/toolbar/toolbar_view.cc

Index: chrome/browser/ui/views/toolbar/toolbar_view.cc
diff --git a/chrome/browser/ui/views/toolbar/toolbar_view.cc b/chrome/browser/ui/views/toolbar/toolbar_view.cc
index 576cf1cf75b1de4cd3403d2600ba740fb12b9132..a4ec47edafc57c575284e2c89fe88bcf3392221d 100644
--- a/chrome/browser/ui/views/toolbar/toolbar_view.cc
+++ b/chrome/browser/ui/views/toolbar/toolbar_view.cc
@@ -514,10 +514,10 @@ gfx::Size ToolbarView::GetPreferredSize() {
   } else {
     const int kPopupBottomSpacingGlass = 1;
     const int kPopupBottomSpacingNonGlass = 2;
-    size.Enlarge(
-        0,
-        PopupTopSpacing() + (GetWidget()->ShouldUseNativeFrame() ?
-            kPopupBottomSpacingGlass : kPopupBottomSpacingNonGlass));
+    size.Enlarge(0,
+                 PopupTopSpacing() + (UsingWindowsGlass()
+                                          ? kPopupBottomSpacingGlass
+                                          : kPopupBottomSpacingNonGlass));
   }
   return size;
 }
@@ -656,7 +656,7 @@ void ToolbarView::OnPaint(gfx::Canvas* canvas) {
   // it from the content area.  For non-glass, the NonClientView draws the
   // toolbar background below the location bar for us.
   // NOTE: Keep this in sync with BrowserView::GetInfoBarSeparatorColor()!
-  if (GetWidget()->ShouldUseNativeFrame())
+  if (UsingWindowsGlass())
     canvas->FillRect(gfx::Rect(0, height() - 1, width(), 1), SK_ColorBLACK);
 }
 
@@ -732,7 +732,14 @@ bool ToolbarView::ShouldShowIncompatibilityWarning() {
 
 int ToolbarView::PopupTopSpacing() const {
   const int kPopupTopSpacingNonGlass = 3;
-  return GetWidget()->ShouldUseNativeFrame() ? 0 : kPopupTopSpacingNonGlass;
+  return UsingWindowsGlass() ? 0 : kPopupTopSpacingNonGlass;
+}
+
+bool ToolbarView::UsingWindowsGlass() const {
+#if defined(OS_WIN)
+  return GetWidget()->ShouldUseNativeFrame();
+#endif
+return false;
 }
 
 void ToolbarView::LoadImages() {