Format and Refactor Flip Server.

Apply clang-format, remove std::cout and so on.
This CL does not change the behavior.

BUG=NONE
R=tyoshino@chromium.org

Review URL: https://codereview.chromium.org/93793004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239672 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239672
Move preconnect hint check into DataReductionProxySettings and add Finch support.

BUG=327081

Review URL: https://codereview.chromium.org/102613003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239673 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239673