style: indentation and other minor style fixes
Merge pull request #477 from pagespeed/jefftk-style

style: indentation and other minor style fixes
headers: simplify header setting

* Remove PopulateRequestHeaders() and PopulateResponseHeaders().
* Set stop copying request headers to the base fetch twice.
  * This fixes a dcheck failure in the debug build.
Merge pull request #484 from pagespeed/jefftk-base-fetch-request-headers

headers: simplify header setting
Merge branch 'master' into trunk-tracking