Revert "[SVG2] Allow leading and trailing whitespace in svg attributes using"

Source/core/svg/SVGNumber.cpp

Index: Source/core/svg/SVGNumber.cpp
diff --git a/Source/core/svg/SVGNumber.cpp b/Source/core/svg/SVGNumber.cpp
index 8e91bbf76e8522e1512bb0a12f9d3494ceb600b0..b50bd1bbfba0154c082d8815ffa3265dde70cd84 100644
--- a/Source/core/svg/SVGNumber.cpp
+++ b/Source/core/svg/SVGNumber.cpp
@@ -62,7 +62,7 @@ String SVGNumber::valueAsString() const
 template<typename CharType>
 bool SVGNumber::parse(const CharType*& ptr, const CharType* end)
 {
-    if (!parseNumber(ptr, end, m_value, AllowLeadingAndTrailingWhitespace)) {
+    if (!parseNumber(ptr, end, m_value, false)) {
         m_value = 0;
         return false;
     }
@@ -127,12 +127,21 @@ PassRefPtr<SVGNumber> SVGNumberAcceptPercentage::clone() const
 
 void SVGNumberAcceptPercentage::setValueAsString(const String& string, ExceptionState& exceptionState)
 {
-    bool valid = parseNumberOrPercentage(string, m_value);
-
-    if (!valid) {
-        exceptionState.throwDOMException(SyntaxError, "The value provided ('" + string + "') is invalid.");
+    if (string.isEmpty()) {
         m_value = 0;
+        return;
     }
+
+    if (string.endsWith('%')) {
+        SVGNumber::setValueAsString(string.left(string.length() - 1), exceptionState);
+        if (exceptionState.hadException())
+            return;
+
+        m_value /= 100.0f;
+        return;
+    }
+
+    SVGNumber::setValueAsString(string, exceptionState);
 }
 
 SVGNumberAcceptPercentage::SVGNumberAcceptPercentage(float value)