Update new tab button even when not visible

The "close all incognito tabs" notification can close tabs when chrome
is not in the foreground. This action bypasses the animation that
would ordinarily reset the normal button's opacity. In order to
correctly reset this opacity, setIsIncognito will be called even if
the button is not visible.

BUG=642682

Review-Url: https://codereview.chromium.org/2335403004
Cr-Commit-Position: refs/heads/master@{#418741}

chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarPhone.java

@@ -2154,7 +2154,7 @@ public class ToolbarPhone extends ToolbarLayout
             updateNtpTransitionAnimation();
         }
 
-        if (inOrEnteringTabSwitcher) mNewTabButton.setIsIncognito(isIncognito);
+        mNewTabButton.setIsIncognito(isIncognito);
 
         CharSequence newTabContentDescription = getResources().getText(
                 isIncognito ? R.string.accessibility_toolbar_btn_new_incognito_tab :