Update new gallery HEAD commit

[guidezpl]

Description

The gallery repository history has been rewritten (see flutter/gallery#87), so updating HEAD commit to make the tree green

Related Issues

flutter/gallery#45

Checklist

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Breaking Change

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[fluttergithubbot]

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie on the #hackers channel in Chat.

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

[dcharkes]

I was trying to fix the same thing.

[flutter-github-sync]

Started Google testing for this PR