[protector] Fix invalid backup signature for extension IDs.
[protector] Fix invalid backup signature for extension IDs.

Actual extensions IDs were used instead of their backup when calculating backup signature.


BUG=121681
TEST=Manual


Review URL: http://codereview.chromium.org/10008045

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@131351 0039d316-1c4b-4281-b951-d872f2087c98

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