Avoid using SVGElementInstance in calcViewport

LayoutTests/svg/animations/use-animate-width-and-height-expected.txt

Index: LayoutTests/svg/animations/use-animate-width-and-height-expected.txt
diff --git a/LayoutTests/svg/animations/use-animate-width-and-height-expected.txt b/LayoutTests/svg/animations/use-animate-width-and-height-expected.txt
new file mode 100644
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+++ b/LayoutTests/svg/animations/use-animate-width-and-height-expected.txt
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+SVG 1.1 dynamic animation tests
+
+Test animation of use element width/height
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS use.width.animVal.value is 100
+PASS use.width.baseVal.value is 100
+PASS use.height.animVal.value is 100
+PASS use.height.baseVal.value is 100
+PASS use.getAttribute('width') is '100'
+PASS use.getAttribute('height') is '100'
+PASS shadowRoot.firstChild.width.animVal.value is 100
+PASS shadowRoot.firstChild.height.animVal.value is 100
+PASS use.width.animVal.value is 105
+PASS use.width.baseVal.value is 100
+PASS use.height.animVal.value is 105
+PASS use.height.baseVal.value is 100
+PASS use.getAttribute('width') is '105'
+PASS use.getAttribute('height') is '105'
+PASS shadowRoot.firstChild.width.animVal.value is 105
+PASS shadowRoot.firstChild.height.animVal.value is 105
+PASS use.width.animVal.value is 115
+PASS use.width.baseVal.value is 100
+PASS use.height.animVal.value is 115
+PASS use.height.baseVal.value is 100
+PASS use.getAttribute('width') is '115'
+PASS use.getAttribute('height') is '115'
+PASS shadowRoot.firstChild.width.animVal.value is 115
+PASS shadowRoot.firstChild.height.animVal.value is 115
+PASS use.width.animVal.value is 125
+PASS use.width.baseVal.value is 100
+PASS use.height.animVal.value is 125
+PASS use.height.baseVal.value is 100
+PASS use.getAttribute('width') is '125'
+PASS use.getAttribute('height') is '125'
+PASS shadowRoot.firstChild.width.animVal.value is 125
+PASS shadowRoot.firstChild.height.animVal.value is 125
+PASS use.width.animVal.value is 135
+PASS use.width.baseVal.value is 100
+PASS use.height.animVal.value is 135
+PASS use.height.baseVal.value is 100
+PASS use.getAttribute('width') is '135'
+PASS use.getAttribute('height') is '135'
+PASS shadowRoot.firstChild.width.animVal.value is 135
+PASS shadowRoot.firstChild.height.animVal.value is 135
+PASS successfullyParsed is true
+
+TEST COMPLETE
+