Removed weird decorative lines.
Removed headers from the middle of the file in context_switching.cc.
Added explicit keyword for scoped_ops_running_stat_t.
Put header file inclusions in the right order.
Moved statements on the same line to sepraate lines in http.cc.
Fixed include order and constness of resource_parts_sep_char.
Added re2/re2.h to the system C++ header list in cpplint, adjusting http.cc accordingly.