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Originally an IDL argument like "[out] int[] foo" will generate
int* foo[]. It means an array of pointers to integers and what we
want is a pointer to an array of integers. Change the output to
int** foo to be not confusing.

BUG=387547
TEST=Run generator and build chrome.

Review URL: https://codereview.chromium.org/490433002

Cr-Commit-Position: refs/heads/master@{#291349}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291349 0039d316-1c4b-4281-b951-d872f2087c98