MD History: Use one-way binding for history query state.

chrome/browser/resources/md_history/router.js

Index: chrome/browser/resources/md_history/router.js
diff --git a/chrome/browser/resources/md_history/router.js b/chrome/browser/resources/md_history/router.js
index 36eacaa8a844154b95cbd53143fa9a13ae66a692..986d5fb1b7b49b9a48105e0c8a2084c02f5dfd16 100644
--- a/chrome/browser/resources/md_history/router.js
+++ b/chrome/browser/resources/md_history/router.js
@@ -12,37 +12,14 @@ Polymer({
       notify: true,
     },
 
-    /** @type {QueryState} */
-    queryState: {
-      type: Object,
-      notify: true,
-      value: function() {
-        // TODO(tsergeant: Move this initialization into query-manager.
-        return {
-          // Whether the most recent query was incremental.
-          incremental: false,
-          // A query is initiated by page load.
-          querying: true,
-          queryingDisabled: false,
-          _range: HistoryRange.ALL_TIME,
-          searchTerm: '',
-          groupedOffset: 0,
-
-          set range(val) {
-            this._range = Number(val);
-          },
-          get range() {
-            return this._range;
-          },
-        };
-      },
-    },
-
     path_: {
       type: String,
       observer: 'pathChanged_',
     },
 
+    /** @type {QueryState} */
+    queryState: Object,
+
     queryParams_: Object,
   },
 
@@ -74,7 +51,7 @@ Polymer({
 
   /** @private */
   queryParamsChanged_: function() {
-    this.set('queryState.searchTerm', this.queryParams_.q || '');
+    this.fire('change-query', {search: this.queryParams_.q || ''});
   },
 
   /** @private */