Update Polymer components.

third_party/polymer/components/iron-behaviors/iron-button-state.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
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@@ skipping 73 matching lines @@
       }
     },
 
     listeners: {
       down: '_downHandler',
       up: '_upHandler',
       tap: '_tapHandler'
     },
 
     observers: [
-      '_detectKeyboardFocus(focused)',
+      '_focusChanged(focused)',
       '_activeChanged(active, ariaActiveAttribute)'
     ],
 
     keyBindings: {
       'enter:keydown': '_asyncClick',
       'space:keydown': '_spaceKeyDownHandler',
       'space:keyup': '_spaceKeyUpHandler',
     },
 
     _mouseEventRe: /^mouse/,
 
     _tapHandler: function() {
       if (this.toggles) {
        // a tap is needed to toggle the active state
         this._userActivate(!this.active);
       } else {
         this.active = false;
       }
     },
 
+    _focusChanged: function(focused) {
+      this._detectKeyboardFocus(focused);
+
+      if (!focused) {
+        this._setPressed(false);
+      }
+    },
+
     _detectKeyboardFocus: function(focused) {
       this._setReceivedFocusFromKeyboard(!this.pointerDown && focused);
     },
 
     // to emulate native checkbox, (de-)activations from a user interaction fire
     // 'change' events
     _userActivate: function(active) {
       if (this.active !== active) {
         this.active = active;
         this.fire('change');
@@ skipping 94 matching lines @@
 
   };
 
   /** @polymerBehavior */
   Polymer.IronButtonState = [
     Polymer.IronA11yKeysBehavior,
     Polymer.IronButtonStateImpl
   ];
 
 </script>