TBR: Fix error line numbers.
TBR: Fix error line numbers.

There were two problems here:

a) We were adding an extra line number for the function
   wrapper, but the wrapper didn't include a newline.

b) WebKit actually expects these to be one-based, not
   zero-based.

So we were ending up two off.

Review URL: http://codereview.chromium.org/18199

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@8273 0039d316-1c4b-4281-b951-d872f2087c98

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