diff --git browser/browser_plugin/browser_plugin_guest.cc browser/browser_plugin/browser_plugin_guest.cc
index b0de6b9..d0cab8f 100644
--- browser/browser_plugin/browser_plugin_guest.cc
+++ browser/browser_plugin/browser_plugin_guest.cc
@@ -23,7 +23,7 @@
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/web_contents/web_contents_impl.h"
-#include "content/browser/web_contents/web_contents_view_guest.h"
+#include "content/browser/web_contents/web_contents_view.h"
 #include "content/common/browser_plugin/browser_plugin_constants.h"
 #include "content/common/browser_plugin/browser_plugin_messages.h"
 #include "content/common/content_constants_internal.h"
@@ -286,20 +286,19 @@ void BrowserPluginGuest::InitInternal(
   guest_window_rect_ = params.view_rect;
 
   if (owner_web_contents_ != owner_web_contents) {
-    WebContentsViewGuest* new_view = nullptr;
+    WebContentsView* new_view = nullptr;
     if (!BrowserPluginGuestMode::UseCrossProcessFramesForGuests()) {
-      new_view =
-          static_cast<WebContentsViewGuest*>(GetWebContents()->GetView());
+      new_view = GetWebContents()->GetView();
     }
 
     if (owner_web_contents_ && new_view)
-      new_view->OnGuestDetached(owner_web_contents_->GetView());
+      delegate_->OnGuestDetached(new_view, owner_web_contents_->GetView());
 
     // Once a BrowserPluginGuest has an embedder WebContents, it's considered to
     // be attached.
     owner_web_contents_ = owner_web_contents;
     if (new_view)
-      new_view->OnGuestAttached(owner_web_contents_->GetView());
+      delegate_->OnGuestAttached(new_view, owner_web_contents_->GetView());
   }
 
   RendererPreferences* renderer_prefs =
@@ -731,12 +730,9 @@ void BrowserPluginGuest::OnWillAttachComplete(
     // This will trigger a callback to RenderViewReady after a round-trip IPC.
     static_cast<RenderViewHostImpl*>(
         GetWebContents()->GetRenderViewHost())->Init();
-    WebContentsViewGuest* web_contents_view =
-        static_cast<WebContentsViewGuest*>(GetWebContents()->GetView());
-    if (!web_contents()->GetRenderViewHost()->GetView()) {
-      web_contents_view->CreateViewForWidget(
-          web_contents()->GetRenderViewHost(), true);
-    }
+    if (!web_contents()->GetRenderViewHost()->GetView())
+      delegate_->CreateViewForWidget(GetWebContents()->GetView(),
+                                     web_contents()->GetRenderViewHost());
   }
 
   InitInternal(params, embedder_web_contents);
diff --git public/browser/browser_plugin_guest_delegate.cc public/browser/browser_plugin_guest_delegate.cc
index fd7dec4..49d4f99 100644
--- public/browser/browser_plugin_guest_delegate.cc
+++ public/browser/browser_plugin_guest_delegate.cc
@@ -4,6 +4,8 @@
 
 #include "content/public/browser/browser_plugin_guest_delegate.h"
 
+#include "content/browser/web_contents/web_contents_view_guest.h"
+
 namespace content {
 
 bool BrowserPluginGuestDelegate::CanRunInDetachedState() const {
@@ -30,4 +32,23 @@ bool BrowserPluginGuestDelegate::StopFinding(StopFindAction action) {
   return false;
 }
 
+void BrowserPluginGuestDelegate::OnGuestAttached(
+    content::WebContentsView* guest_view,
+    content::WebContentsView* parent_view) {
+  static_cast<WebContentsViewGuest*>(guest_view)->OnGuestAttached(parent_view);
+}
+
+void BrowserPluginGuestDelegate::OnGuestDetached(
+    content::WebContentsView* guest_view,
+    content::WebContentsView* parent_view) {
+  static_cast<WebContentsViewGuest*>(guest_view)->OnGuestAttached(parent_view);
+}
+
+void BrowserPluginGuestDelegate::CreateViewForWidget(
+    content::WebContentsView* guest_view,
+    content::RenderWidgetHost* render_widget_host) {
+  static_cast<WebContentsViewGuest*>(guest_view)->CreateViewForWidget(
+      render_widget_host, true);
+}
+
 }  // namespace content
diff --git public/browser/browser_plugin_guest_delegate.h public/browser/browser_plugin_guest_delegate.h
index 000e3b6..ced8765 100644
--- public/browser/browser_plugin_guest_delegate.h
+++ public/browser/browser_plugin_guest_delegate.h
@@ -21,6 +21,8 @@ class Size;
 namespace content {
 
 class GuestHost;
+class RenderWidgetHost;
+class WebContentsView;
 
 // Objects implement this interface to get notified about changes in the guest
 // WebContents and to provide necessary functionality.
@@ -86,6 +88,17 @@ class CONTENT_EXPORT BrowserPluginGuestDelegate {
   // Provides the delegate with an interface with which to communicate with the
   // content module.
   virtual void SetGuestHost(GuestHost* guest_host) {}
+
+  // Called when a guest is attached or detached.
+  virtual void OnGuestAttached(content::WebContentsView* guest_view,
+                               content::WebContentsView* parent_view);
+  virtual void OnGuestDetached(content::WebContentsView* guest_view,
+                               content::WebContentsView* parent_view);
+
+  // Called to create the view for the widget.
+  virtual void CreateViewForWidget(
+      content::WebContentsView* guest_view,
+      content::RenderWidgetHost* render_widget_host);
 };
 
 }  // namespace content