[Chromecast] Turn CastContentWindow into an abstract interface.

chromecast/browser/service/cast_service_simple.cc

Index: chromecast/browser/service/cast_service_simple.cc
diff --git a/chromecast/browser/service/cast_service_simple.cc b/chromecast/browser/service/cast_service_simple.cc
index 25ebc50a4aeb0e60ebf4742f35d29699ffd7fdae..74c34f5affeff65660b553d08abe1091ec5c83a7 100644
--- a/chromecast/browser/service/cast_service_simple.cc
+++ b/chromecast/browser/service/cast_service_simple.cc
@@ -4,9 +4,11 @@
 
 #include "chromecast/browser/service/cast_service_simple.h"
 
+#include <string>
+
 #include "base/command_line.h"
 #include "base/files/file_util.h"
-#include "chromecast/browser/cast_content_window.h"
+#include "base/memory/ptr_util.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "net/base/filename_util.h"
@@ -51,9 +53,9 @@ void CastServiceSimple::FinalizeInternal() {
 }
 
 void CastServiceSimple::StartInternal() {
-  window_.reset(new CastContentWindow);
+  window_ = CastContentWindow::Create(this);
   web_contents_ = window_->CreateWebContents(browser_context());
-  window_->CreateWindowTree(web_contents_.get());
+  window_->ShowWebContents(web_contents_.get());
 
   web_contents_->GetController().LoadURL(startup_url_, content::Referrer(),
                                          ui::PAGE_TRANSITION_TYPED,
@@ -66,5 +68,9 @@ void CastServiceSimple::StopInternal() {
   window_.reset();
 }
 
+void CastServiceSimple::OnWindowDestroyed() {}
+
+void CastServiceSimple::OnKeyEvent(const ui::KeyEvent& key_event) {}
+
 }  // namespace shell
 }  // namespace chromecast