Revert "Load web contents after tab is created."

This reverts commit 4c55f398def3214369aefa9f2f2e8f5940d3799d.

BUG=432562
TBR=tedchoc@chromium.org,jbudorick@chromium.org,sky@chromium.org

Review URL: https://codereview.chromium.org/894003005

Cr-Commit-Position: refs/heads/master@{#314469}
void ReleaseAllMediaPlayers(content::WebContents* web_contents,
                            content::RenderFrameHost* render_frame_host) {
  content::BrowserMediaPlayerManager* manager =
      static_cast<content::WebContentsImpl*>(web_contents)->
          media_web_contents_observer()->GetMediaPlayerManager(
              render_frame_host);
  if (manager)
    manager->ReleaseAllMediaPlayers();
}

void ReleaseAllMediaPlayers(content::WebContents* web_contents,
                            content::RenderFrameHost* render_frame_host) {
  content::BrowserMediaPlayerManager* manager =
      static_cast<content::WebContentsImpl*>(web_contents)->
          media_web_contents_observer()->GetMediaPlayerManager(
              render_frame_host);
  if (manager)
    manager->ReleaseAllMediaPlayers();
}
