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Chrome iOS is moving to Objective-C Automatic Reference Counting. Under
it, arguments are supposed to be autoreleased. This CL changes the constructor to retain its argument..
This is a part of a multiple CL setup that will change the Image(UIImage*) constructor from consuming +1 refcount to retaining the argument.

TEST=none
BUG=645125

Review-Url: https://codereview.chromium.org/2500373004
Cr-Commit-Position: refs/heads/master@{#438223}