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Currently, we use wrong storage type for nested arrays. For example, the storage
type of the outer array of int8[][] is
StructPointer<Array_Data<int8_t>>. After this CL it will be
ArrayPointer<int8_t>.

The current code works because StructPointer happens to be of the same
size as ArrayPointer.

(The newly-added tests pass with/without this CL. But I think it is good
to have them.)

BUG=None
TEST=None

Review URL: https://codereview.chromium.org/340223002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278356 0039d316-1c4b-4281-b951-d872f2087c98