Connect the LocalDB to TabManager.

Bug: 773382
Change-Id: Iec8fe5226ee175105d51f300f30b4865478ac099
Reviewed-on: https://chromium-review.googlesource.com/1118611
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572871}
TabLifecycleUnitSource::TabLifecycleUnit::GetRenderProcessHost() const {
  return GetWebContents()->GetMainFrame()->GetProcess();
}

TabLifecycleUnitSource::TabLifecycleUnit::GetRenderProcessHost() const {
  return GetWebContents()->GetMainFrame()->GetProcess();
}
