Roll Polymer from 1.5.0 -> 1.6.0 to pick up native CSS custom props

third_party/polymer/v1_0/components-chromium/iron-location/iron-location-extracted.js

Index: third_party/polymer/v1_0/components-chromium/iron-location/iron-location-extracted.js
diff --git a/third_party/polymer/v1_0/components-chromium/iron-location/iron-location-extracted.js b/third_party/polymer/v1_0/components-chromium/iron-location/iron-location-extracted.js
index 15e6cef8badc8fc87a9b3e90d1e8f2307c55f291..7bf2c00e1234742525d8813286da9013fb330c58 100644
--- a/third_party/polymer/v1_0/components-chromium/iron-location/iron-location-extracted.js
+++ b/third_party/polymer/v1_0/components-chromium/iron-location/iron-location-extracted.js
@@ -179,9 +179,14 @@
       if (!href) {
         return;
       }
+      event.preventDefault();
+      // If the navigation is to the current page we shouldn't add a history
+      // entry or fire a change event.
+      if (href === window.location.href) {
+        return;
+      }
       window.history.pushState({}, '', href);
       this.fire('location-changed', {}, {node: window});
-      event.preventDefault();
     },
     /**
      * Returns the absolute URL of the link (if any) that this click event
@@ -264,11 +269,6 @@
       // Need to use a full URL in case the containing page has a base URI.
       var fullNormalizedHref = new URL(
           normalizedHref, window.location.href).href;
-      // If the navigation is to the current page we shouldn't add a history
-      // entry.
-      if (fullNormalizedHref === window.location.href) {
-        return null;
-      }
       return fullNormalizedHref;
     },
     _makeRegExp: function(urlSpaceRegex) {