Reland #1 of: Move WebUI ownership from the RenderFrameHostManager to the RenderFrameHost.

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index 13f78d9c936f2208f03007c4ec71f5e9e3b291df..5c59b903e93d5752aea45aee4a4b1ce8e727143a 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -9,6 +9,7 @@
 
 #include "base/basictypes.h"
 #include "base/i18n/rtl.h"
+#include "content/browser/webui/web_ui_impl.h"

[nasko, 2015/11/18 23:48:03]

Can we forward declare WebUIImpl here instead of including it?

[carlosk, 2015/11/19 16:49:13]

No because scoped_ptr requires the type to be defined. 

Curiously this is an almost 3 years old change:
https://codereview.chromium.org/11149006

I updated the respective section of the Coding Style to clarify that:
https://sites.google.com/a/chromium.org/dev/developers/coding-style?pli=1#TOC...

 #include "content/common/content_export.h"
 #include "content/common/frame_message_enums.h"
 #include "content/public/browser/site_instance.h"
@@ -172,6 +173,10 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   // https://crbug.com/330264.
   virtual void EnsureOpenerProxiesExist(RenderFrameHost* source_rfh) {}
 
+  // Creates a WebUI object for a frame navigating to the given URL. If no WebUI

[nasko, 2015/11/18 23:48:03]

nit: s/to the given URL/to |url|/

[carlosk, 2015/11/19 16:49:13]

Done.

+  // applies, returns null.
+  virtual scoped_ptr<WebUIImpl> CreateWebUIForRenderFrameHost(const GURL& url);
+
 #if defined(OS_WIN)
   // Returns the frame's parent's NativeViewAccessible.
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();