Enable MSVC warning for unused locals.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 9d6b2e2e662ce5287583e907cba01822f41e097e..16c2ce3e4b35ad7f48ca17b7f91445146b393162 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -670,7 +670,7 @@ gfx::NativeViewAccessible RenderWidgetHostViewAura::GetNativeViewAccessible() {
   aura::WindowTreeHost* host = window_->GetHost();
   if (!host)
     return static_cast<gfx::NativeViewAccessible>(NULL);
-  HWND hwnd = host->GetAcceleratedWidget();
+  // ?? Should this use host instead of host_?

[no sievers, 2014/11/18 19:27:27]

No I'm guessing GetHost() is just to check that the view is actually currently
attached and early-out if not. Maybe you'd hit the NOTIMPLEMENTED() below
otherwise.

[Peter Kasting, 2014/11/18 20:45:31]

OK.  Removed comment.

   BrowserAccessibilityManager* manager =
       host_->GetOrCreateRootBrowserAccessibilityManager();
   if (manager)