media: Remove BrowserCdmFactory inferface.

media/base/browser_cdm_factory.cc

-// Copyright 2014 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 "media/base/browser_cdm_factory.h"
-
-#include "base/logging.h"
-
-#if defined(OS_ANDROID)
-#include "media/base/android/browser_cdm_factory_android.h"
-#endif
-
-namespace media {
-
-namespace {
-BrowserCdmFactory* g_cdm_factory = NULL;
-}
-
-void SetBrowserCdmFactory(BrowserCdmFactory* factory) {
-  DCHECK(!g_cdm_factory);
-  g_cdm_factory = factory;
-}
-
-scoped_refptr<MediaKeys> CreateBrowserCdm(
-    const std::string& key_system,
-    bool use_hw_secure_codecs,
-    const SessionMessageCB& session_message_cb,
-    const SessionClosedCB& session_closed_cb,
-    const LegacySessionErrorCB& legacy_session_error_cb,
-    const SessionKeysChangeCB& session_keys_change_cb,
-    const SessionExpirationUpdateCB& session_expiration_update_cb) {
-  if (!g_cdm_factory) {
-#if defined(OS_ANDROID)
-    SetBrowserCdmFactory(new BrowserCdmFactoryAndroid());
-#else
-    LOG(ERROR) << "Cannot create BrowserCdm: no BrowserCdmFactory available!";
-    return nullptr;
-#endif
-  }
-
-  return g_cdm_factory->CreateBrowserCdm(
-      key_system, use_hw_secure_codecs, session_message_cb, session_closed_cb,
-      legacy_session_error_cb, session_keys_change_cb,
-      session_expiration_update_cb);
-}
-
-}  // namespace media