Cleanup: Fix style errors and remove unused #includes in net/base/net_util.h, and fix missing #includes elsewhere as a result.

Review URL: https://codereview.chromium.org/25183003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228546 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228546