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}
bool RenderProcessHost::ShouldTryToUseExistingProcessHost(
    BrowserContext* browser_context,
    const GURL& url) {
  if (run_renderer_in_process())
    return true;

  if (SiteIsolationPolicy::UseDedicatedProcessesForAllSites())
    return false;

  if (g_all_hosts.Get().size() >= GetMaxRendererProcessCount())
    return true;

  return GetContentClient()->browser()->ShouldTryToUseExistingProcessHost(
      browser_context, url);
}

bool RenderProcessHost::ShouldTryToUseExistingProcessHost(
    BrowserContext* browser_context,
    const GURL& url) {
  if (run_renderer_in_process())
    return true;

  if (SiteIsolationPolicy::UseDedicatedProcessesForAllSites())
    return false;

  if (g_all_hosts.Get().size() >= GetMaxRendererProcessCount())
    return true;

  return GetContentClient()->browser()->ShouldTryToUseExistingProcessHost(
      browser_context, url);
}
