Revert of Add CastMediaBlocker and BrowserTest

chromecast/browser/cast_media_blocker.cc

Index: chromecast/browser/cast_media_blocker.cc
diff --git a/chromecast/browser/cast_media_blocker.cc b/chromecast/browser/cast_media_blocker.cc
deleted file mode 100644
index e0cf795514fe9e957147df4a2cf633eb43785d55..0000000000000000000000000000000000000000
--- a/chromecast/browser/cast_media_blocker.cc
+++ /dev/null
@@ -1,58 +0,0 @@
-// 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 "chromecast/browser/cast_media_blocker.h"
-
-#include "base/threading/thread_checker.h"
-#include "content/public/browser/web_contents.h"
-
-namespace chromecast {
-namespace shell {
-
-CastMediaBlocker::CastMediaBlocker(content::WebContents* web_contents)
-    : content::WebContentsObserver(web_contents),
-      controllable_(false),
-      suspended_(false),
-      state_(UNBLOCKED) {}
-
-CastMediaBlocker::~CastMediaBlocker() {}
-
-void CastMediaBlocker::BlockMediaLoading(bool blocked) {
-  if (blocked) {
-    state_ = BLOCKED;
-  } else if (state_ == BLOCKED) {
-    state_ = UNBLOCKING;
-  }
-
-  UpdateMediaBlockedState();
-}
-
-void CastMediaBlocker::UpdateMediaBlockedState() {
-  if (!web_contents()) {
-    return;
-  }
-
-  if (!controllable_) {
-    return;
-  }
-
-  if (state_ == BLOCKED && !suspended_) {
-    web_contents()->SuspendMediaSession();
-  } else if (state_ == UNBLOCKING && suspended_) {
-    web_contents()->ResumeMediaSession();
-    state_ = UNBLOCKED;
-  }
-}
-
-void CastMediaBlocker::MediaSessionStateChanged(
-    bool is_controllable,
-    bool is_suspended,
-    const base::Optional<content::MediaMetadata>& metadata) {
-  controllable_ = is_controllable;
-  suspended_ = is_suspended;
-  UpdateMediaBlockedState();
-}
-
-}  // namespace shell
-}  // namespace chromecast