MD Settings: Convert all usages of .bind(this) to use ES6 arrow function.

chrome/browser/resources/settings/internet_page/network_summary.js

Index: chrome/browser/resources/settings/internet_page/network_summary.js
diff --git a/chrome/browser/resources/settings/internet_page/network_summary.js b/chrome/browser/resources/settings/internet_page/network_summary.js
index 3f83c7af26a3fdd7ec9f4de73054f27140e4f933..a1c6dea26650871ad5f403c4d57ace2a99ec6530 100644
--- a/chrome/browser/resources/settings/internet_page/network_summary.js
+++ b/chrome/browser/resources/settings/internet_page/network_summary.js
@@ -223,10 +223,10 @@ Polymer({
    */
   getNetworkLists_: function() {
     // First get the device states.
-    this.networkingPrivate.getDeviceStates(function(deviceStates) {
+    this.networkingPrivate.getDeviceStates(deviceStates => {
       // Second get the network states.
       this.getNetworkStates_(deviceStates);
-    }.bind(this));
+    });
   },
 
   /**
@@ -242,9 +242,9 @@ Polymer({
       visible: true,
       configured: false
     };
-    this.networkingPrivate.getNetworks(filter, function(networkStates) {
+    this.networkingPrivate.getNetworks(filter, networkStates => {
       this.updateNetworkStates_(networkStates, deviceStates);
-    }.bind(this));
+    });
   },
 
   /**