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Since narrowing conversion in the `{}` is ill-formed in C++11, it raises
compile error with G++ 4.8.2.

BUG=

Review URL: https://codereview.chromium.org/294523007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271427 0039d316-1c4b-4281-b951-d872f2087c98