Roll Observatory deps (charted -> ^0.3.0)

packages/charted/lib/core/utils/namespace.dart

 //
 // Copyright 2014 Google Inc. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 //
 
 part of charted.core.utils;
 
 /// Basic namespace handing for Charted - includes utilities to
 /// parse the namespace prefixes and to create DOM elements using a
 /// namespace.
 class Namespace {
   /// Supported namespace prefixes mapped to their URIs.
-  static const Map<String,String> NS_PREFIXES = const {
+  static const Map<String, String> NS_PREFIXES = const {
     "svg": "http://www.w3.org/2000/svg",
     "xhtml": "http://www.w3.org/1999/xhtml",
     "xlink": "http://www.w3.org/1999/xlink",
     "xml": "http://www.w3.org/XML/1998/namespace",
     "xmlns": "http://www.w3.org/2000/xmlns/"
   };
 
   /// Create an element from [tag]. If tag is prefixed with a
   /// supported namespace prefix, the created element will
   /// have the namespaceUri set to the correct URI.
   static Element createChildElement(String tag, Element parent) {
     var separatorIndex = tag.indexOf(':');
     if (separatorIndex == -1 && parent != null) {
       return parent.ownerDocument.createElementNS(parent.namespaceUri, tag);
     }
     Namespace parsed = new Namespace._internal(tag, separatorIndex);
-    return parsed.namespaceUri == null ?
-        parent.ownerDocument.createElementNS(parent.namespaceUri, tag) :
-        parent.ownerDocument.createElementNS(parsed.namespaceUri,
-            parsed.localName);
+    return parsed.namespaceUri == null
+        ? parent.ownerDocument.createElementNS(parent.namespaceUri, tag)
+        : parent.ownerDocument
+            .createElementNS(parsed.namespaceUri, parsed.localName);
   }
 
   /// Local part of the Element's tag name.
   String localName;
 
   /// Name space URI for the selected namespace.
   String namespaceUri;
 
   /// Parses a tag for namespace prefix and local name.
   /// If a known namespace prefix is found, sets the namespaceUri property
   /// to the URI of the namespace.
   factory Namespace(String tagName) =>
       new Namespace._internal(tagName, tagName.indexOf(':'));
 
   /// Utility for use by createChildElement and factory constructor.
   Namespace._internal(String tagName, int separatorIdx) {
     String prefix = tagName;
     if (separatorIdx >= 0) {
       prefix = tagName.substring(0, separatorIdx);
       localName = tagName.substring(separatorIdx + 1);
     }
 
     if (NS_PREFIXES.containsKey(prefix)) {
       namespaceUri = NS_PREFIXES[prefix];
     } else {
       localName = tagName;
     }
   }
 }