Remove updateLayoutTreeIfNeeded from SVGElement::invalidateInstances
Remove updateLayoutTreeIfNeeded from SVGElement::invalidateInstances

There is no need to update the layout tree when instances are
invalidated. This fixes an O(n^2) performance bug when updating
<use> trees.

BUG=565120

Review URL: https://codereview.chromium.org/1498323002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#363393}

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