Fix more closure warnings.

Author: Steven Orvell

closure.log

@@ -725,31 +725,7 @@ Found    : PolymerElement
       this.registrations.forEach(this._regLog);
                                  ^^^^
 
-/polymer.html_script_12.js:81: WARNING - Type annotation references non-existent type Polymer.Debouncer.
-   * @param {Polymer.Debouncer?} debouncer Debouncer object.
-             ^^^^^^^^^^^^^^^^^
-
-/polymer.html_script_21.js:189: WARNING - Dangerous use of the global THIS object
-        return this.node[method].apply(this.node, arguments);
-               ^^^^
-
-/polymer.html_script_21.js:189: WARNING - Dangerous use of the global THIS object
-        return this.node[method].apply(this.node, arguments);
-                                       ^^^^
-
-/polymer.html_script_21.js:203: WARNING - Dangerous use of the global THIS object
-          return this.node[name];
-                 ^^^^
-
-/polymer.html_script_21.js:215: WARNING - Dangerous use of the global THIS object
-          return this.node[name];
-                 ^^^^
-
-/polymer.html_script_21.js:218: WARNING - Dangerous use of the global THIS object
-          this.node[name] = value;
-          ^^^^
-
-/polymer.html_script_21.js:339: WARNING - Property polyfillWrapFlushCallback never defined on window.customElements of type CustomElementRegistry
+/polymer.html_script_21.js:331: WARNING - Property polyfillWrapFlushCallback never defined on window.customElements of type CustomElementRegistry
     !(window.customElements.polyfillWrapFlushCallback);
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
@@ -1439,4 +1415,4 @@ externs/closure-types.js:759: WARNING - property toggle on interface Polymer_Arr
 Polymer_ArraySelectorMixin.prototype.toggle;
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-0 error(s), 315 warning(s), 72.6% typed
+0 error(s), 309 warning(s), 72.6% typed

lib/legacy/polymer.dom.html

@@ -193,11 +193,7 @@
   function forwardMethods(proto, methods) {
     for (let i=0; i < methods.length; i++) {
       let method = methods[i];
-      /**
-       * @this {DomApi}
-       * @return {*} Returns method value
-       */
-      proto[method] = function() {
+      proto[method] = /** @this {DomApi} */ function() {
         return this.node[method].apply(this.node, arguments);
       }
     }
@@ -207,12 +203,8 @@
     for (let i=0; i < properties.length; i++) {
       let name = properties[i];
       Object.defineProperty(proto, name, {
-        /**
-         * @this {DomApi}
-         * @return {*} Returns property value
-         */
         get: function() {
-          return this.node[name];
+          return /** @type {DomApi} */ (this).node[name];
         },
         configurable: true
       });
@@ -224,10 +216,10 @@
       let name = properties[i];
       Object.defineProperty(proto, name, {
         get: function() {
-          return this.node[name];
+          return /** @type {DomApi} */ (this).node[name];
         },
         set: function(value) {
-          this.node[name] = value;
+          /** @type {DomApi} */ (this).node[name] = value;
         },
         configurable: true
       });

lib/utils/debounce.html

@@ -91,7 +91,7 @@
    * `_debounceWork` method. Then in a test, call `Polymer.flush` to ensure
    * the debouncer has completed.
    *
-   * @param {Polymer.Debouncer?} debouncer Debouncer object.
+   * @param {Debouncer?} debouncer Debouncer object.
    * @param {!AsyncModule} asyncModule Object with Async interface
    * @param {function()} callback Callback to run.
    * @return {!Debouncer} Returns a debouncer object.