Make chrome_tests build on Win64 

Just c4267 build suppressions. 

BUG=166496
BUG=167187
TBR=brettw@chromium.org
R=brettw@chromium.org

Review URL: https://chromiumcodereview.appspot.com/12295005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@183062 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed