arc: Use high-resolution icon for Play Store default item for scale >= 1.5f.

There was previously a typo in this line. We should pick the high-resolution
icon when scale >= 1.5f and the low-resolution icon otherwise.

BUG=648998
BUG=b/31596656
TEST=samus verify icon is high resolution in app list before arc opt-in
TBR=xiyuan

Review-Url: https://codereview.chromium.org/2360873004
Cr-Commit-Position: refs/heads/master@{#420572}

chrome/browser/ui/app_list/arc/arc_app_icon.cc

@@ -88,7 +88,7 @@ gfx::ImageSkiaRep ArcAppIcon::Source::GetImageForScale(float scale) {
   int resource_id;
   if (host_ && host_->app_id() == arc::kPlayStoreAppId) {
     resource_id = scale >= 1.5f ?
-        IDR_ARC_SUPPORT_ICON_48 : IDR_ARC_SUPPORT_ICON_96;
+        IDR_ARC_SUPPORT_ICON_96 : IDR_ARC_SUPPORT_ICON_48;
   } else {
     resource_id = IDR_APP_DEFAULT_ICON;
   }