Declare exe_name and cmd_line as const pointers and use const_cast only where necessary.
Declare exe_name and cmd_line as const pointers and use
const_cast only where necessary.

Fix a FORWARD_NULL defect reported by Coverity.  Pass
cmd_line to sandbox::WideToMultiByte only if cmd_line
is not NULL.

R=rvargas
BUG=http://crbug.com/17101
TEST=none
Review URL: http://codereview.chromium.org/155969

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@21406 0039d316-1c4b-4281-b951-d872f2087c98

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