[Clean up] Fix style guide nits in chrome/browser/resources/ntp4.

chrome/browser/resources/ntp4/apps_page.css

Index: chrome/browser/resources/ntp4/apps_page.css
diff --git a/chrome/browser/resources/ntp4/apps_page.css b/chrome/browser/resources/ntp4/apps_page.css
index 7d7239ddead5638b3634275706a323aa49c65530..c2f51c6dc2f45b3521a80123a4938dd8ab971d96 100644
--- a/chrome/browser/resources/ntp4/apps_page.css
+++ b/chrome/browser/resources/ntp4/apps_page.css
@@ -35,10 +35,10 @@
 }
 
 .app-img-container {
+  /* -webkit-mask-image set by JavaScript to the image source. */
+  -webkit-mask-size: 100% 100%;
   margin-left: auto;
   margin-right: auto;
-  /* -webkit-mask-image set by JavaScript to the image source */
-  -webkit-mask-size: 100% 100%;
 }
 
 .app-img-container > * {
@@ -47,6 +47,8 @@
 }
 
 .app-icon-div {
+  -webkit-box-align: center;
+  -webkit-box-pack: center;
   background-color: white;
   border: 1px solid #d5d5d5;
   border-radius: 5px;
@@ -56,8 +58,6 @@
   position: relative;
   vertical-align: middle;
   z-index: 0;
-  -webkit-box-align: center;
-  -webkit-box-pack: center;
 }
 
 .app-icon-div .app-img-container {
@@ -92,11 +92,11 @@
 /* Notifications */
 
 .app-notification {
+  -webkit-transition: color 150ms linear;
   color: #999;
   display: block;
   font-size: 11px;
   white-space: nowrap;
-  -webkit-transition: color 150ms linear;
 }
 
 .app-notification:hover {
@@ -148,12 +148,13 @@ html[dir='rtl'] .apps-promo-extras {
 }
 
 .apps-promo-heading {
+  -webkit-margin-start: 3px;
   font-weight: bold;
   margin-bottom: 5px;
-  -webkit-margin-start: 3px;
 }
 
 .g-button-basic {
+  -webkit-border-image: url('images/app_promo_button.png') 6 10 12 6;
   border-width: 6px 10px 12px 6px;
   color: #fff !important;
   display: inline-block;
@@ -163,7 +164,6 @@ html[dir='rtl'] .apps-promo-extras {
   text-align: center;
   text-decoration: none;
   white-space: nowrap;
-  -webkit-border-image: url('images/app_promo_button.png') 6 10 12 6;
 }
 
 .app .invisible {