Move net/base/sys_byteorder.h to base/sys_byteorder.h

Two motivations:
  (1) There are currently clients in src/crypto that need the same logic.
  (2) There is soon to be a client in src/chrome/common that needs the 64-bit version of this logic, which is currently inlined in a src/crypto implementation file.

BUG=103480
TEST=compiles


Review URL: http://codereview.chromium.org/8949026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@115926 0039d316-1c4b-4281-b951-d872f2087c98
27 files changed