linux_aura: Fix all instances of LabelButton sizing.

chrome/browser/ui/libgtk2ui/gtk2_border.cc

Index: chrome/browser/ui/libgtk2ui/gtk2_border.cc
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_border.cc b/chrome/browser/ui/libgtk2ui/gtk2_border.cc
index 9648a6926a124810fa0a5034f7efe6a8e85176ec..0ef1d97d781be7ff5930b06618ccc1f3707af08d 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_border.cc
+++ b/chrome/browser/ui/libgtk2ui/gtk2_border.cc
@@ -120,11 +120,7 @@ void Gtk2Border::Paint(const views::View& view, gfx::Canvas* canvas) {
 }
 
 gfx::Insets Gtk2Border::GetInsets() const {
-  ui::ThemeProvider* provider = owning_button_->GetThemeProvider();
-  if (!provider || !provider->UsingNativeTheme())
-    return border_->GetInsets();
-
-  return gtk2_ui_->GetButtonInsets();
+  return border_->GetInsets();
 }
 
 gfx::Size Gtk2Border::GetMinimumSize() const {