[Chromecast] Add CastWebContents

chromecast/browser/cast_content_window_linux.h

Index: chromecast/browser/cast_content_window_linux.h
diff --git a/chromecast/browser/cast_content_window_linux.h b/chromecast/browser/cast_content_window_linux.h
index 98d9c04116fde6b722a45bfa76948d956fa1e84e..0da8e858fc2039912b8aa8f6d1d96886f0551130 100644
--- a/chromecast/browser/cast_content_window_linux.h
+++ b/chromecast/browser/cast_content_window_linux.h
@@ -10,7 +10,6 @@
 #include "base/macros.h"
 #include "chromecast/browser/cast_content_window.h"
 #include "chromecast/graphics/cast_vsync_settings.h"
-#include "content/public/browser/web_contents_observer.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 
 namespace aura {
@@ -18,7 +17,6 @@ class WindowTreeHost;
 }
 
 namespace content {
-class BrowserContext;
 class WebContents;
 }
 
@@ -26,7 +24,6 @@ namespace chromecast {
 namespace shell {
 
 class CastContentWindowLinux : public CastContentWindow,
-                               public content::WebContentsObserver,
                                public CastVSyncSettings::Observer {
  public:
   // Removes the window from the screen.
@@ -35,16 +32,6 @@ class CastContentWindowLinux : public CastContentWindow,
   // CastContentWindow implementation.
   void SetTransparent() override;
   void ShowWebContents(content::WebContents* web_contents) override;
-  std::unique_ptr<content::WebContents> CreateWebContents(
-      content::BrowserContext* browser_context) override;
-
-  // content::WebContentsObserver implementation:
-  void DidFirstVisuallyNonEmptyPaint() override;
-  void MediaStartedPlaying(const MediaPlayerInfo& media_info,
-                           const MediaPlayerId& id) override;
-  void MediaStoppedPlaying(const MediaPlayerInfo& media_info,
-                           const MediaPlayerId& id) override;
-  void RenderViewCreated(content::RenderViewHost* render_view_host) override;
 
   // CastVSyncSettings::Observer implementation:
   void OnVSyncIntervalChanged(base::TimeDelta interval) override;