Move version-agnostic functions from spdy_test_util_spdy[23] to _common.

There are some functions in net/spdy/spdy_test_util_spdy[23] that are
identical across the two files.  Move them into net/spdy/spdy_test_util_common
and include spdy_test_util_common.h in _spdy[23].h so tests can see them.

BUG=226192


Review URL: https://chromiumcodereview.appspot.com/13582002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192262 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed