ash: minor style cleanup

BUG=none
TEST=none

Change-Id: Id5f71a89565e056867c599f64731beca1d6a2622
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2239203
Commit-Queue: Scott Violet <sky@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Auto-Submit: Scott Violet <sky@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#777003}

ash/system/message_center/stacked_notification_bar.cc

@@ -326,23 +326,23 @@ void StackedNotificationBar::SetExpanded() {
 void StackedNotificationBar::AddNotificationIcon(
     message_center::Notification* notification,
     bool at_front) {
-  views::ImageView* icon_view_ =
+  views::ImageView* icon_view =
       new StackedNotificationBarIcon(this, notification->id());
   if (at_front)
-    notification_icons_container_->AddChildViewAt(icon_view_, 0);
+    notification_icons_container_->AddChildViewAt(icon_view, 0);
   else
-    notification_icons_container_->AddChildView(icon_view_);
+    notification_icons_container_->AddChildView(icon_view);
 
   gfx::Image masked_small_icon = notification->GenerateMaskedSmallIcon(
       kStackedNotificationIconSize,
       message_center::kNotificationDefaultAccentColor);
 
   if (masked_small_icon.IsEmpty()) {
-    icon_view_->SetImage(gfx::CreateVectorIcon(
+    icon_view->SetImage(gfx::CreateVectorIcon(
         message_center::kProductIcon, kStackedNotificationIconSize,
         message_center::kNotificationDefaultAccentColor));
   } else {
-    icon_view_->SetImage(masked_small_icon.AsImageSkia());
+    icon_view->SetImage(masked_small_icon.AsImageSkia());
   }
 }