Fix symbol-named function template properties in the API

Fix symbol-named function template properties in the API

Thanks to Yutaka Hirano <yhirano@chromium.org>; for finding the bug and
providing the test case.

R=rossberg@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=23269

[wingo, 2014-08-21 08:36:57]

The path taken to get to this bug is twisted -- api.cc's
ObjectTemplate::NewInstance calls execution.cc calls the Instantiate function
from apinatives.js with one argument, which visits the strange property array to
initialize the template, which eventually recurses and calls Instantiate() with
two arguments, the second one being a symbol name, which then flows into
InstantiateFunction, which eventually fails to FunctionSetName with a symbol
argument.

[rossberg, 2014-08-21 11:22:28]

LGTM

[wingo, 2014-08-21 11:55:55]

Committed patchset #1 manually as 23269 (presubmit successful).

[yhirano, 2014-08-21 12:10:42]

Thank you for the fix!