Make remoting_unittests build on Win64 

Two simple compilation fixes and some c4267 build suppressions. 

BUG=166496
BUG=167187
R=wez@chromium.org
Review URL: https://codereview.chromium.org/12225111

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@181650 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed