Print Preview: Fix compile errors in settings/ directory

chrome/browser/resources/print_preview/settings/copies_settings.js

Index: chrome/browser/resources/print_preview/settings/copies_settings.js
diff --git a/chrome/browser/resources/print_preview/settings/copies_settings.js b/chrome/browser/resources/print_preview/settings/copies_settings.js
index cfd5bbd10499e3337dd88b07ab42f507b51c7f38..946fd89a598fc4f46067d968d1af9ffe54eeaed5 100644
--- a/chrome/browser/resources/print_preview/settings/copies_settings.js
+++ b/chrome/browser/resources/print_preview/settings/copies_settings.js
@@ -51,7 +51,7 @@ cr.define('print_preview', function() {
      * @private
      */
     this.inputField_ = null;
-  };
+  }
 
   /**
    * Delay in milliseconds before processing the textfield.
@@ -87,20 +87,21 @@ cr.define('print_preview', function() {
     enterDocument: function() {
       this.inputField_ = this.getChildElement('input.user-value');

[dpapad, 2017/05/04 01:20:04]

Nit: Maybe
this.inputField_ = assert(this.getChildElement('input.user-value'));
and avoid the need for a second var pointing to the same object?

[rbpotter, 2017/05/04 01:43:07]

Done.

       print_preview.SettingsSection.prototype.enterDocument.call(this);
+      var inputField = assert(this.inputField_);
       this.tracker.add(
-          this.inputField_,
+          inputField,
           'keydown',
           this.onTextfieldKeyDown_.bind(this));
       this.tracker.add(
-          this.inputField_,
+          inputField,
           'input',
           this.onTextfieldInput_.bind(this));
       this.tracker.add(
-          this.inputField_,
+          inputField,
           'blur',
           this.onTextfieldBlur_.bind(this));
       this.tracker.add(
-          this.getChildElement('input.collate'),
+          assert(this.getChildElement('input.collate')),
           'click',
           this.onCollateCheckboxClick_.bind(this));
       this.tracker.add(