Move core web_view code to extensions.

extensions/browser/guest_view/web_view/web_view_guest_delegate.h

Index: extensions/browser/guest_view/web_view/web_view_guest_delegate.h
diff --git a/extensions/browser/guest_view/web_view/web_view_guest_delegate.h b/extensions/browser/guest_view/web_view/web_view_guest_delegate.h
index d72ae0ee6f5c4a46975d1cd48fd18b3761e2ca0b..0b54e72b43e79dd5b81e20d577f0d2d1303b01f5 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest_delegate.h
+++ b/extensions/browser/guest_view/web_view/web_view_guest_delegate.h
@@ -14,6 +14,8 @@ class WebContents;
 
 namespace extensions {
 
+class WebViewGuest;
+
 namespace api {
 namespace web_view_internal{
 
@@ -25,7 +27,7 @@ struct ContextMenuItem;
 // A delegate class of WebViewGuest that are not a part of chrome.
 class WebViewGuestDelegate {
  public :
-  WebViewGuestDelegate();
+  explicit WebViewGuestDelegate(WebViewGuest* web_view_guest);
   virtual ~WebViewGuestDelegate();
 
   typedef std::vector<linked_ptr<api::web_view_internal::ContextMenuItem> >
@@ -40,6 +42,9 @@ class WebViewGuestDelegate {
   // Called to attach helpers just after additional initialization is performed.
   virtual void OnAttachWebViewHelpers(content::WebContents* contents) = 0;
 
+  // Called to perform some cleanup prior to destruction.
+  virtual void OnEmbedderDestroyed() = 0;
+
   // Called when the guest WebContents commits a provisional load in any frame.
   virtual void OnDidCommitProvisionalLoadForFrame(bool is_main_frame) = 0;
 
@@ -63,7 +68,11 @@ class WebViewGuestDelegate {
       int request_id,
       const MenuItemVector* items) = 0;
 
+  WebViewGuest* web_view_guest() const { return web_view_guest_; }
+
  private:
+  WebViewGuest* const web_view_guest_;
+
   DISALLOW_COPY_AND_ASSIGN(WebViewGuestDelegate);
 };