Get rid of the last RenderViewHostDelegate usage in chrome.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
===================================================================
--- content/browser/web_contents/web_contents_impl.cc	(revision 138434)
+++ content/browser/web_contents/web_contents_impl.cc	(working copy)
@@ -1306,6 +1306,10 @@
   return new_tab_start_time_;
 }
 
+void WebContentsImpl::Close() {
+  Close(GetRenderViewHost());
+}
+
 void WebContentsImpl::OnCloseStarted() {
   if (close_start_time_.is_null())
     close_start_time_ = base::TimeTicks::Now();
@@ -1330,6 +1334,10 @@
     delegate_->DragEnded();
 }
 
+void WebContentsImpl::UserGestureDone() {
+  OnUserGesture();
+}
+
 void WebContentsImpl::SetClosedByUserGesture(bool value) {
   closed_by_user_gesture_ = value;
 }