Fix warning that is now an error.
Fix warning that is now an error.

C:\b\slave\chromium-rel-xp\build\src\sandbox\src\sandbox.cc(16) : warning C4010: single-line comment contains line-continuation character

Review URL: http://codereview.chromium.org/788003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@41164 0039d316-1c4b-4281-b951-d872f2087c98

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