[TabManager] Move TabManager into chrome/browser/resource_coordinator.

This patch moves TabManager and other related class into
chrome/browser/resource_coordinator, they are tab_manager* and tab_stats.*,
header include and BUILD files are also updated.

Review-Url: https://codereview.chromium.org/2898033002
Cr-Commit-Position: refs/heads/master@{#476136}
33 files changed