Remove redundant isLayoutSizeChanged check in LayoutSVGText::layout

SVGLayoutSupport::layoutChildren takes care to propagate the needs for
metrics updates via the |screenScalingFactorChanged| and
|layoutSizeChanged| arguments.

BUG=603956

Review-Url: https://codereview.chromium.org/2061793003
Cr-Commit-Position: refs/heads/master@{#399796}
1 file changed