Move GetCursor() method from WindowDelegate to its own delegate interface CursorDelegate.

content/browser/web_contents/web_contents_view_aura.cc

Index: content/browser/web_contents/web_contents_view_aura.cc
diff --git a/content/browser/web_contents/web_contents_view_aura.cc b/content/browser/web_contents/web_contents_view_aura.cc
index 05b72cda8a4e76d34a80596e7007e3db641152c9..9f2dc96cd49dc9c2d59bfda49524f8b6904f1452 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -1368,10 +1368,6 @@ void WebContentsViewAura::OnBoundsChanged(const gfx::Rect& old_bounds,
   }
 }
 
-gfx::NativeCursor WebContentsViewAura::GetCursor(const gfx::Point& point) {
-  return gfx::kNullCursor;
-}
-
 int WebContentsViewAura::GetNonClientComponent(const gfx::Point& point) const {
   return HTCLIENT;
 }