Switching AudioOutputAuthorizationHandler from using AudioManager interface to AudioSystem one.

BUG=672468
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2692203003
Cr-Commit-Position: refs/heads/master@{#450939}
void RenderProcessHostImpl::RegisterProcessHostForSite(
    BrowserContext* browser_context,
    RenderProcessHost* process,
    const GURL& url) {
  SiteProcessMap* map = GetSiteProcessMapForBrowserContext(browser_context);

  std::string site =
      SiteInstance::GetSiteForURL(browser_context, url).possibly_invalid_spec();
  if (!site.empty())
    map->RegisterProcess(site, process);
}

void RenderProcessHostImpl::RegisterProcessHostForSite(
    BrowserContext* browser_context,
    RenderProcessHost* process,
    const GURL& url) {
  SiteProcessMap* map = GetSiteProcessMapForBrowserContext(browser_context);

  std::string site =
      SiteInstance::GetSiteForURL(browser_context, url).possibly_invalid_spec();
  if (!site.empty())
    map->RegisterProcess(site, process);
}
