I am releasing a new version of lib-gwt-svg to preserve compatibility with Chrome 48+. Indeed Chrome 48+ has begun dropping compatibility with several SVG1.1 features in their quest to implement new SVG2.0 features. The sad thing is that they dropped SVG 1.1 features before they even provided a working SVG2.0 replacement !
You can get details on the removed APIs here:
SVGPathSeg interfaces (removed)
Deprecate/Remove SVGGraphicsElement.getTransformToElement (removed)
I have also noted another difference in the behavior of Chrome 48 which broke some of my HTML games. SVG elements with a width and height of 100% will not be sized correctly: they will scale to the greatest of the two dimensions and not fit into the viewport anymore. I do not think this can be addressed with a polyfill, but I was able to use the following workaround: make the SVG elements absolute and use absolute CSS positioning with width=100% and height=100% to restore the original behavior.