[Chromecast] Simplify CastMediaBlocker.

chromecast/browser/cast_media_blocker_unittest.cc

Index: chromecast/browser/cast_media_blocker_unittest.cc
diff --git a/chromecast/browser/cast_media_blocker_unittest.cc b/chromecast/browser/cast_media_blocker_unittest.cc
index 8bd152e70c03e00684446cba67f3cea0c98cb17d..25d8a3227b472f46ff2c687b9ab399f59d0fa114 100644
--- a/chromecast/browser/cast_media_blocker_unittest.cc
+++ b/chromecast/browser/cast_media_blocker_unittest.cc
@@ -54,8 +54,7 @@ class CastMediaBlockerTest : public content::RenderViewHostTestHarness {
     content::RenderViewHostTestHarness::SetUp();
     media_session_ = base::MakeUnique<MockMediaSession>(
         content::MediaSession::Get(web_contents()));
-    media_blocker_ = base::MakeUnique<CastMediaBlocker>(media_session_.get(),
-                                                        web_contents());
+    media_blocker_ = base::MakeUnique<CastMediaBlocker>(media_session_.get());
 
     content::WebContentsTester::For(web_contents())
         ->NavigateAndCommit(GURL("https://www.youtube.com"));