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

Source/core/svg/SVGNumber.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 44 matching lines @@
 }
 
 String SVGNumber::valueAsString() const
 {
     return String::number(m_value);
 }
 
 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;
     }
 
     if (ptr != end) {
         m_value = 0;
         return false;
     }
 
     return true;
@@ skipping 44 matching lines @@
     return fabsf(m_value - toSVGNumber(other)->value());
 }
 
 PassRefPtr<SVGNumber> SVGNumberAcceptPercentage::clone() const
 {
     return create(m_value);
 }
 
 void SVGNumberAcceptPercentage::setValueAsString(const String& string, ExceptionState& exceptionState)
 {
-    bool valid = parseNumberOrPercentage(string, m_value);
+    if (string.isEmpty()) {
+        m_value = 0;
+        return;
+    }
 
-    if (!valid) {
-        exceptionState.throwDOMException(SyntaxError, "The value provided ('" + string + "') is invalid.");
-        m_value = 0;
+    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)
     : SVGNumber(value)
 {
 }
 
 }