Drop workaround for object.onLoad

facebook/react#5781 has been fixed in React 15.0, so
drop our workaroud for it.

src/components/views/elements/TintableSvg.js

@@ -43,14 +43,10 @@ var TintableSvg = React.createClass({
     componentDidMount: function() {
         this.id = TintableSvg.idSequence++;
         TintableSvg.mounts[this.id] = this;
-        // we can't use onLoad on object due to https://github.com/facebook/react/pull/5781
-        // so handle it with pure DOM instead
-        ReactDOM.findDOMNode(this).addEventListener('load', this.onLoad);
     },
 
     componentWillUnmount: function() {
         delete TintableSvg.mounts[this.id];
-        ReactDOM.findDOMNode(this).removeEventListener('load', this.onLoad);
     },
 
     tint: function() {
@@ -71,9 +67,11 @@ var TintableSvg = React.createClass({
                     type="image/svg+xml"
                     data={ this.props.src }
                     width={ this.props.width }
-                    height={ this.props.height }/>
+                    height={ this.props.height }
+                    onLoad={ this.onLoad }
+                />
         );
     }
 });
 
-module.exports = TintableSvg;
+module.exports = TintableSvg;