Make WebUIImpl a WebContentsObserver to re-use RenderViewCreated()

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 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/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 3754 matching lines @@
     return;
 
   if (delegate_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 
   NotificationService::current()->Notify(
       NOTIFICATION_WEB_CONTENTS_RENDER_VIEW_HOST_CREATED,
       Source<WebContents>(this),
       Details<RenderViewHost>(render_view_host));
 
-  // When we're creating views, we're still doing initial setup, so we always
-  // use the pending Web UI rather than any possibly existing committed one.
-  if (GetRenderManager()->pending_web_ui())

[Charlie Reis, 2015/08/28 17:05:56]

I'm noticing that this old code only passes on the RenderViewCreated call if
there's a pending or speculative WebUI object, and not for other
RenderViewHosts.  See my note in WebUIImpl::RenderViewCreated about the
implications.

-    GetRenderManager()->pending_web_ui()->RenderViewCreated(render_view_host);
-
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableBrowserSideNavigation) &&
-      GetRenderManager()->speculative_web_ui()) {
-    GetRenderManager()->speculative_web_ui()->RenderViewCreated(
-        render_view_host);
-  }
-
   NavigationEntry* entry = controller_.GetPendingEntry();
   if (entry && entry->IsViewSourceMode()) {
     // Put the renderer in view source mode.
     render_view_host->Send(
         new ViewMsg_EnableViewSourceMode(render_view_host->GetRoutingID()));
   }
 
   view_->RenderViewCreated(render_view_host);
 
   FOR_EACH_OBSERVER(
@@ skipping 818 matching lines @@
   player_map->erase(it);
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content