Don't set v8_optimized_debug as default value, but as actual value

Otherwise, it doesn't have any effect, because it collides with the
default value set already by v8

BUG=none
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Review URL: https://codereview.chromium.org/19192003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@211782 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed