Refactor ViewsDelegate singleton

chrome/browser/ui/views/frame/opaque_browser_frame_view.cc

Index: chrome/browser/ui/views/frame/opaque_browser_frame_view.cc
diff --git a/chrome/browser/ui/views/frame/opaque_browser_frame_view.cc b/chrome/browser/ui/views/frame/opaque_browser_frame_view.cc
index e155e51c47ea007750f8692a2b0b897033229e4a..60b3046ad03e37aba95e9cf287d89bacb5a430c6 100644
--- a/chrome/browser/ui/views/frame/opaque_browser_frame_view.cc
+++ b/chrome/browser/ui/views/frame/opaque_browser_frame_view.cc
@@ -582,10 +582,10 @@ bool OpaqueBrowserFrameView::ShouldShowWindowTitleBar() const {
 
   // Do not show caption buttons if the window manager is forcefully providing a
   // title bar (e.g., in Ubuntu Unity, if the window is maximized).
-  if (!views::ViewsDelegate::views_delegate)
+  if (!views::ViewsDelegate::GetInstance())
     return true;
-  return !views::ViewsDelegate::views_delegate->WindowManagerProvidesTitleBar(
-              IsMaximized());
+  return !views::ViewsDelegate::GetInstance()->WindowManagerProvidesTitleBar(
+      IsMaximized());
 }
 
 void OpaqueBrowserFrameView::PaintRestoredFrameBorder(gfx::Canvas* canvas) {