collapse mixins:

remove logging; folded into legacy-element
remove event-listeners and annotations; folded into element.

Author: Steven Orvell

src/legacy/legacy-element.html

@@ -14,7 +14,6 @@
 <link rel="import" href="../lib/async-render.html">
 <link rel="import" href="../lib/unresolved.html">
 <link rel="import" href="polymer.dom.html">
-<link rel="import" href="logging.html">
 
 <script>
 (function() {
@@ -23,10 +22,12 @@
 
   var utils = Polymer.Utils;
 
+  const hasColor = (window.chrome && !(/edge/i.test(navigator.userAgent))) || (/firefox/i.test(navigator.userAgent));
+  const prefix = hasColor ? ['%c[%s::%s]:', 'font-weight: bold; background-color:#EEEE00;'] : ['[%s::%s]:'];
+
   Polymer.LegacyElementMixin = Polymer.Utils.dedupingMixin(function(base) {
 
-    const mixin = Polymer.Logging(
-      Polymer.GestureEventListeners(Polymer.ElementMixin(base)));
+    const mixin = Polymer.GestureEventListeners(Polymer.ElementMixin(base));
 
     return class LegacyElement extends mixin {
 
@@ -711,6 +712,36 @@
         return null;
       }
 
+      // logging
+      _logger(level, args) {
+        // accept ['foo', 'bar'] and [['foo', 'bar']]
+        if (Array.isArray(args) && args.length === 1) {
+          args = args[0];
+        }
+        switch(level) {
+          case 'log':
+          case 'warn':
+          case 'error':
+            console[level](...args);
+        }
+      }
+
+      _log(...args) {
+        this._logger('log', args);
+      }
+
+      _warn(...args) {
+        this._logger('warn', args);
+      }
+
+      _error(...args) {
+        this._logger('error', args)
+      }
+
+      _logf(...args) {
+        return prefix.concat(this.is).concat(args);
+      }
+
     }
 
   });