Print Preview: Fix top level directory compile errors

chrome/browser/resources/print_preview/print_preview_animations.js

Index: chrome/browser/resources/print_preview/print_preview_animations.js
diff --git a/chrome/browser/resources/print_preview/print_preview_animations.js b/chrome/browser/resources/print_preview/print_preview_animations.js
index b8b1a19b06756f40f4df5e7aa09f0d98e8fef877..d931694e1ceb4b9adaba532f5426b08358e12aa8 100644
--- a/chrome/browser/resources/print_preview/print_preview_animations.js
+++ b/chrome/browser/resources/print_preview/print_preview_animations.js
@@ -5,7 +5,7 @@
 // Counter used to give animations unique names.
 var animationCounter = 0;
 
-var animationEventTracker_ = new EventTracker();
+var animationEventTracker = new EventTracker();
 
 function addAnimation(code) {
   var name = 'anim' + animationCounter;
@@ -54,7 +54,7 @@ function fadeInElement(el, opt_justShow) {
   } else {
     el.style.height = height + 'px';
     var animName = addAnimation(getFadeInAnimationCode(height));
-    animationEventTracker_.add(
+    animationEventTracker.add(
         el, 'animationend', onFadeInAnimationEnd.bind(el), false);
     el.style.animationName = animName;
   }
@@ -73,8 +73,9 @@ function fadeOutElement(el) {
   el.style.height = 'auto';
   var height = el.offsetHeight;
   el.style.height = height + 'px';
+  /** @suppress {suspiciousCode} */
   el.offsetHeight;  // Should force an update of the computed style.
-  animationEventTracker_.add(
+  animationEventTracker.add(
       el, 'transitionend', onFadeOutTransitionEnd.bind(el), false);
   el.classList.add('closing');
   el.classList.remove('visible');
@@ -89,7 +90,7 @@ function fadeOutElement(el) {
 function onFadeOutTransitionEnd(event) {
   if (event.propertyName != 'height')
     return;
-  animationEventTracker_.remove(this, 'transitionend');
+  animationEventTracker.remove(this, 'transitionend');
   this.hidden = true;
 }
 
@@ -113,7 +114,7 @@ function fadeInAnimationCleanup(element) {
     if (animEl)
       animEl.parentNode.removeChild(animEl);
     element.style.animationName = '';
-    animationEventTracker_.remove(element, 'animationend');
+    animationEventTracker.remove(element, 'animationend');
   }
 }
 
@@ -129,14 +130,16 @@ function fadeInOption(el, opt_justShow) {
   // To make the option visible during the first fade in.
   el.hidden = false;
 
-  var leftColumn = el.querySelector('.left-column');
+  var leftColumn = assertInstanceof(el.querySelector('.left-column'),
+                                    HTMLElement);
   wrapContentsInDiv(leftColumn, ['invisible']);
-  var rightColumn = el.querySelector('.right-column');
+  var rightColumn = assertInstanceof(el.querySelector('.right-column'),
+                                     HTMLElement);
   wrapContentsInDiv(rightColumn, ['invisible']);
 
   var toAnimate = el.querySelectorAll('.collapsible');
   for (var i = 0; i < toAnimate.length; i++)
-    fadeInElement(toAnimate[i], opt_justShow);
+    fadeInElement(assertInstanceof(toAnimate[i], HTMLElement), opt_justShow);
   el.classList.add('visible');
 }
 
@@ -150,10 +153,13 @@ function fadeOutOption(el, opt_justHide) {
   if (!el.classList.contains('visible'))
     return;
 
-  var leftColumn = el.querySelector('.left-column');
+  var leftColumn = assertInstanceof(el.querySelector('.left-column'),
+                                    HTMLElement);
   wrapContentsInDiv(leftColumn, ['visible']);
-  var rightColumn = el.querySelector('.right-column');
-  wrapContentsInDiv(rightColumn, ['visible']);
+  var rightColumn = assertInstanceof(el.querySelector('.right-column'),
+                                     HTMLElement);
+  if (rightColumn)
+    wrapContentsInDiv(rightColumn, ['visible']);
 
   var toAnimate = el.querySelectorAll('.collapsible');
   for (var i = 0; i < toAnimate.length; i++) {
@@ -162,7 +168,7 @@ function fadeOutOption(el, opt_justHide) {
       toAnimate[i].classList.add('closing');
       toAnimate[i].classList.remove('visible');
     } else {
-      fadeOutElement(toAnimate[i]);
+      fadeOutElement(assertInstanceof(toAnimate[i], HTMLElement));
     }
   }
   el.classList.remove('visible');
@@ -172,8 +178,8 @@ function fadeOutOption(el, opt_justHide) {
  * Wraps the contents of |el| in a div element and attaches css classes
  * |classes| in the new div, only if has not been already done. It is necessary
  * for animating the height of table cells.
- * @param {HTMLElement} el The element to be processed.
- * @param {array} classes The css classes to add.
+ * @param {!HTMLElement} el The element to be processed.
+ * @param {!Array} classes The css classes to add.
  */
 function wrapContentsInDiv(el, classes) {
   var div = el.querySelector('div');