Link MediaSessionTabHelper with native MediaSession [CL is going to be split]

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 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 "content/browser/web_contents/web_contents_impl.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 3760 matching lines @@
   // for the new page has committed.
   RenderViewHostImpl* rvhi =
       static_cast<RenderViewHostImpl*>(render_view_message_source_);
   if (!rvhi->is_active())
     return;
 
   for (auto& observer : observers_)
     observer.DidUpdateFaviconURL(candidates);
 }
 
-void WebContentsImpl::OnMediaSessionStateChanged() {
-  MediaSession* session = MediaSession::Get(this);
-  for (auto& observer : observers_) {
-    observer.MediaSessionStateChanged(session->IsControllable(),
-                                       session->IsSuspended());
-  }
-}
-
-void WebContentsImpl::OnMediaSessionMetadataChanged() {
-  MediaSession* session = MediaSession::Get(this);
-  for (auto& observer : observers_) {
-    observer.MediaSessionMetadataChanged(session->metadata());
-  }
-}
-
-void WebContentsImpl::ResumeMediaSession() {
-  MediaSession::Get(this)->Resume(MediaSession::SuspendType::UI);
-}
-
-void WebContentsImpl::SuspendMediaSession() {
-  MediaSession::Get(this)->Suspend(MediaSession::SuspendType::UI);
-}
-
-void WebContentsImpl::StopMediaSession() {
-  MediaSession::Get(this)->Stop(MediaSession::SuspendType::UI);
-}
-
 void WebContentsImpl::OnPasswordInputShownOnHttp() {
   controller_.ssl_manager()->DidShowPasswordInputOnHttp();
 }
 
 void WebContentsImpl::OnCreditCardInputShownOnHttp() {
   controller_.ssl_manager()->DidShowCreditCardInputOnHttp();
 }
 
 void WebContentsImpl::OnFirstVisuallyNonEmptyPaint() {
   for (auto& observer : observers_)
@@ skipping 1369 matching lines @@
   dialog_manager_ = dialog_manager;
 }
 
 void WebContentsImpl::RemoveBindingSet(const std::string& interface_name) {
   auto it = binding_sets_.find(interface_name);
   if (it != binding_sets_.end())
     binding_sets_.erase(it);
 }
 
 }  // namespace content