Bug 1378032 - Don't call setTabsCounterPrivateMode on Tablet in Photon. r=walkingice

In Photon, TabCounter has a new design and implementation which handles itself
private mode visual refresh by calling `TabCounter#setPrivateMode(boolean)`.

So we shouldn't call setTabsCounterPrivateMode anymore in BrowserToolbarTabletBase.

MozReview-Commit-ID: LKu4OiTQyJV

--HG--
extra : rebase_source : c31216fcc50e2c8aeadbd03773968c90b5b2f585

mobile/android/base/java/org/mozilla/gecko/toolbar/BrowserToolbarTabletBase.java

@@ -11,6 +11,7 @@ import android.support.v4.content.ContextCompat;
 import org.mozilla.gecko.R;
 import org.mozilla.gecko.Tab;
 import org.mozilla.gecko.Tabs;
+import org.mozilla.gecko.skin.SkinConfig;
 import org.mozilla.gecko.tabs.TabHistoryController;
 import org.mozilla.gecko.menu.MenuItemActionBar;
 import org.mozilla.gecko.util.HardwareUtils;
@@ -145,11 +146,13 @@ abstract class BrowserToolbarTabletBase extends BrowserToolbar {
     public void setPrivateMode(final boolean isPrivate) {
         super.setPrivateMode(isPrivate);
 
+        if (SkinConfig.isAustralis()) {
             // If we had backgroundTintList, we could remove the colorFilter
             // code in favor of setPrivateMode (bug 1197432).
             final PorterDuffColorFilter colorFilter =
                     isPrivate ? privateBrowsingTabletMenuItemColorFilter : null;
             setTabsCounterPrivateMode(isPrivate, colorFilter);
+        }
 
         backButton.setPrivateMode(isPrivate);
         forwardButton.setPrivateMode(isPrivate);