[Chromecast] Simplify CastMediaBlocker.

chromecast/browser/cast_media_blocker_browsertest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chromecast/browser/cast_media_blocker.h"
 #include "chromecast/browser/test/cast_browser_test.h"
@@ skipping 26 matching lines @@
     query_params.push_back(std::make_pair("loop", "true"));
 
     std::string query = media::GetURLQueryString(query_params);
     GURL gurl = content::GetFileUrlWithQuery(
         media::GetTestDataFilePath("player.html"), query);
 
     web_contents_ = NavigateToURL(gurl);
     WaitForLoadStop(web_contents_);
 
     blocker_ = base::MakeUnique<CastMediaBlocker>(
-        content::MediaSession::Get(web_contents_), web_contents_);
+        content::MediaSession::Get(web_contents_));
   }
 
   void BlockAndTestPlayerState(const std::string& media_type, bool blocked) {
     blocker_->BlockMediaLoading(blocked);
 
     // Changing states is not instant, but should be timely (< 0.5s).
     for (size_t i = 0; i < 5; i++) {
       base::RunLoop run_loop;
       base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
           FROM_HERE, run_loop.QuitClosure(),
@@ skipping 39 matching lines @@
 IN_PROC_BROWSER_TEST_F(CastMediaBlockerBrowserTest, Video_BlockUnblock) {
   PlayMedia("video", "tulip2.webm");
 
   BlockAndTestPlayerState("video", true);
   BlockAndTestPlayerState("video", false);
 }
 #endif
 
 }  // namespace shell
 }  // namespace chromecast