Remove DialogDelegate::UseNewStyle and unused code.

chrome/browser/chromeos/power/idle_action_warning_dialog_view.cc

Index: chrome/browser/chromeos/power/idle_action_warning_dialog_view.cc
diff --git a/chrome/browser/chromeos/power/idle_action_warning_dialog_view.cc b/chrome/browser/chromeos/power/idle_action_warning_dialog_view.cc
index 8c99893ac9e87ad97946669aa84a797ef320485c..8cde2ddf3de6213bbe0b6720f666e32d88e0fbc3 100644
--- a/chrome/browser/chromeos/power/idle_action_warning_dialog_view.cc
+++ b/chrome/browser/chromeos/power/idle_action_warning_dialog_view.cc
@@ -57,15 +57,9 @@ IdleActionWarningDialogView::IdleActionWarningDialogView() : closing_(false) {
   FixedWidthLabel* content = new FixedWidthLabel(
         l10n_util::GetStringUTF16(IDS_IDLE_WARNING_LOGOUT_WARNING),
         kIdleActionWarningContentWidth);
-  if (DialogDelegate::UseNewStyle()) {
-    content->set_border(views::Border::CreateEmptyBorder(
-        views::kPanelVertMargin, views::kButtonHEdgeMarginNew,
-        views::kPanelVertMargin, views::kButtonHEdgeMarginNew));
-  } else {
-    content->set_border(views::Border::CreateEmptyBorder(
-        views::kPanelVertMargin, views::kPanelHorizMargin,
-        views::kPanelVertMargin, views::kPanelHorizMargin));
-  }
+  content->set_border(views::Border::CreateEmptyBorder(
+      views::kPanelVertMargin, views::kButtonHEdgeMarginNew,
+      views::kPanelVertMargin, views::kButtonHEdgeMarginNew));
   AddChildView(content);
   SetLayoutManager(new views::FillLayout());