fixup! refactor($compile): move img[srcset] sanitizing to helper method

Author: jbedard

src/ng/compile.js

@@ -1902,7 +1902,7 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
         nodeName = nodeName_(this.$$element);
 
         // Sanitize img[srcset] + source[srcset] values.
-        if ((nodeName === 'img' || nodeName === 'source') && key === 'srcset') {
+        if (nodeName === 'img' && key === 'srcset') {
           this[key] = value = sanitizeSrcset(value, '$set(\'srcset\', value)');
         }