Helper functions for tracking stale TabContentsDelegate's.

content/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 605 matching lines @@
                                  WindowOpenDisposition disposition,
                                  const gfx::Rect& initial_pos,
                                  bool user_gesture) {
   if (!delegate_)
     return;
 
   delegate_->AddNewContents(this, new_contents, disposition, initial_pos,
                             user_gesture);
 }
 
+void TabContents::set_delegate(TabContentsDelegate* delegate) {
+  if (delegate == delegate_)
+    return;
+
+  if (delegate_)
+    delegate_->Detach(this);
+
+  delegate_ = delegate;
+
+  if (delegate_)
+    delegate_->Attach(this);
+}
+
 gfx::NativeView TabContents::GetContentNativeView() const {
   return view_->GetContentNativeView();
 }
 
 gfx::NativeView TabContents::GetNativeView() const {
   return view_->GetNativeView();
 }
 
 void TabContents::GetContainerBounds(gfx::Rect *out) const {
   view_->GetContainerBounds(out);
@@ skipping 1202 matching lines @@
 
 void TabContents::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = view()->CreateViewForWidget(rvh);
   rwh_view->SetSize(view()->GetContainerSize());
 }
 
 void TabContents::OnOnlineStateChanged(bool online) {
   render_view_host()->Send(new ViewMsg_NetworkStateChanged(
       render_view_host()->routing_id(), online));
 }