chore(element.js): Moved webdriver element specific methods into prot…

…otype

lib/element.js

@@ -65,21 +65,20 @@ var ElementArrayFinder = function(ptor, getWebElements, locator, opt_actionResul
   this.getWebElements = getWebElements || null;
   this.actionResults_ = opt_actionResults;
   this.locator_ = locator;
-
-  var self = this;
-  WEB_ELEMENT_FUNCTIONS.forEach(function(fnName) {
-    self[fnName] = function() {
-      var args = arguments;
-      var actionFn = function(webElem) {
-        return webElem[fnName].apply(webElem, args);
-      };
-      return self.applyAction_(actionFn);
-    };
-  });
 };
 
 exports.ElementArrayFinder = ElementArrayFinder;
 
+WEB_ELEMENT_FUNCTIONS.forEach(function(fnName) {
+  ElementArrayFinder.prototype[fnName] = function() {
+    var args = arguments;
+    var actionFn = function(webElem) {
+      return webElem[fnName].apply(webElem, args);
+    };
+    return this.applyAction_(actionFn);
+  };
+});
+
 /**
  * Create a shallow copy of ElementArrayFinder.
  *
@@ -692,16 +691,6 @@ var ElementFinder = function(ptor, elementArrayFinder) {
   this.elementArrayFinder_ = new ElementArrayFinder(
       this.ptor_, getWebElements, elementArrayFinder.locator_,
       elementArrayFinder.actionResults_);
-
-  // Decorate ElementFinder with webdriver functions. Simply calls the
-  // underlying elementArrayFinder to perform these functions.
-  var self = this;
-  WEB_ELEMENT_FUNCTIONS.forEach(function(fnName) {
-    self[fnName] = function() {
-      return self.elementArrayFinder_[fnName].
-          apply(self.elementArrayFinder_, arguments).toElementFinder_();
-    };
-  });
 };
 
 exports.ElementFinder = ElementFinder;
@@ -714,6 +703,13 @@ ElementFinder.fromWebElement_ = function(ptor, webElem, locator) {
       toElementFinder_();
 };
 
+WEB_ELEMENT_FUNCTIONS.forEach(function(fnName) {
+  ElementFinder.prototype[fnName] = function() {
+    return this.elementArrayFinder_[fnName].
+      apply(this.elementArrayFinder_, arguments).toElementFinder_();
+  };
+});
+
 /**
  * Create a shallow copy of ElementFinder.
  *