Mojo: Move compile-asserts back into .cc file.

(Using an evil trick discussed in
https://codereview.chromium.org/174093004/.)

R=yzshen@chromium.org

Review URL: https://codereview.chromium.org/166423003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252665 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252665
Mojo: Convert MessageInTransit* -> scoped_ptr<MessageInTransit>, part 2.

R=yzshen@chromium.org

Review URL: https://codereview.chromium.org/174593004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252666 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252666