Fix DCHECK when loading chrome://net-internals
Fix DCHECK when loading chrome://net-internals

TEST=visit chrome://net-internals and [::1] in a debug build, it shouldn't crash
BUG=NONE

Review URL: http://codereview.chromium.org/3359006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@58535 0039d316-1c4b-4281-b951-d872f2087c98

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