Remove all usage on POLYMER2

code base is on polymer 2 already

Change-Id: Ic5c9e3181c972fb5baeab3d870276005a7e9fcf0
(cherry picked from commit 34486c286e)

polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js

@@ -369,7 +369,6 @@
     },
 
     _getListItems() {
-      // Polymer2: querySelectorAll returns NodeList instead of Array.
       return Array.from(
           Polymer.dom(this.root).querySelectorAll('gr-change-list-item'));
     },

polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.js

@@ -332,7 +332,6 @@
     },
 
     get diffs() {
-      // Polymer2: querySelectorAll returns NodeList instead of Array.
       return Array.from(
           Polymer.dom(this.root).querySelectorAll('gr-diff-host'));
     },
@@ -926,7 +925,6 @@
     _filesChanged() {
       if (this._files && this._files.length > 0) {
         Polymer.dom.flush();
-        // Polymer2: querySelectorAll returns NodeList instead of Array.
         const files = Array.from(
             Polymer.dom(this.root).querySelectorAll('.file-row'));
         this.$.fileCursor.stops = files;

polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.js

@@ -422,7 +422,6 @@
      * @return {!Array<!HTMLElement>}
      */
     getThreadEls() {
-      // Polymer2: querySelectorAll returns NodeList instead of Array.
       return Array.from(
           Polymer.dom(this.$.diff).querySelectorAll('.comment-thread'));
     },

polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection.js

@@ -73,8 +73,6 @@
     },
 
     _handleDownOnRangeComment(node) {
-      // Keep the original behavior in polymer 1
-      if (!window.POLYMER2) return false;
       if (node &&
           node.nodeName &&
           node.nodeName.toLowerCase() === 'gr-comment-thread') {
@@ -183,13 +181,10 @@
      * For Polymer 2, use shadowRoot.getSelection instead.
      */
     _getSelection() {
-      let selection;
-      if (window.POLYMER2) {
-        const diffHost = util.querySelector(document.body, 'gr-diff');
-        selection = diffHost &&
-          diffHost.shadowRoot &&
-          diffHost.shadowRoot.getSelection();
-      }
+      const diffHost = util.querySelector(document.body, 'gr-diff');
+      const selection = diffHost &&
+        diffHost.shadowRoot &&
+        diffHost.shadowRoot.getSelection();
       return selection ? selection: window.getSelection();
     },
 

polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js

@@ -436,7 +436,6 @@
         return [];
       }
 
-      // Polymer2: querySelectorAll returns NodeList instead of Array.
       return Array.from(
           Polymer.dom(this.root).querySelectorAll('.diff-row'));
     },

polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js

@@ -169,10 +169,7 @@
         dialog.querySelectorAll('gr-autocomplete')
             .forEach(input => { input.text = ''; });
 
-        // TODO: reveiw binding for input after drop Polymer 1 support
-        // All docs related to Polymer 2 set binding only for iron-input,
-        // and doesn't add binding to input.
-        dialog.querySelectorAll(window.POLYMER2 ? 'iron-input' : 'input')
+        dialog.querySelectorAll('iron-input')
             .forEach(input => { input.bindValue = ''; });
       }
 

polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.js

@@ -74,7 +74,6 @@
     },
 
     _getEndpointParams() {
-      // Polymer2: querySelectorAll returns NodeList instead of Array.
       return Array.from(
           Polymer.dom(this).querySelectorAll('gr-endpoint-param'));
     },

polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.js

@@ -41,7 +41,6 @@
      * @return {!Array<string>}
      */
     _getDisplayedColumns() {
-      // Polymer2: querySelectorAll returns NodeList instead of Array.
       return Array.from(Polymer.dom(this.root)
           .querySelectorAll('.checkboxContainer input:not([name=number])'))
           .filter(checkbox => checkbox.checked)

polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.js

@@ -119,7 +119,6 @@
     },
 
     get accountChips() {
-      // Polymer2: querySelectorAll returns NodeList instead of Array.
       return Array.from(
           Polymer.dom(this.root).querySelectorAll('gr-account-chip'));
     },

polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown.js

@@ -161,7 +161,6 @@
       if (this.suggestions.length > 0) {
         if (!this.isHidden) {
           Polymer.dom.flush();
-          // Polymer2: querySelectorAll returns NodeList instead of Array.
           this._suggestionEls = Array.from(
               this.$.suggestions.querySelectorAll('li'));
           this._resetCursorIndex();

polygerrit-ui/app/test/common-test-setup.html

@@ -20,7 +20,6 @@ limitations under the License.
     href="/bower_components/polymer-resin/standalone/polymer-resin.html" />
 <link rel="import" href="../behaviors/safe-types-behavior/safe-types-behavior.html">
 <script>
-  window.POLYMER2 = true;
   security.polymer_resin.install({
     allowedIdentifierPrefixes: [''],
     reportHandler(isViolation, fmt, ...args) {

polygerrit-ui/app/test/common-test-setup.js

@@ -15,8 +15,6 @@
  * limitations under the License.
  */
 
-window.POLYMER2 = true;
-
 /**
  * Helps looking up the proper iron-input element during the Polymer 2
  * transition. Polymer 2 uses the <iron-input> element, while Polymer 1 uses