Increase the tab closure timeout for accessibility

Increase the tab closure timeout for accessibility to
allow enough time for the 'Reopen Closed Tab' text
to be read and the user to take action.

BUG=528386

Review URL: https://codereview.chromium.org/1420433008

Cr-Commit-Position: refs/heads/master@{#357108}

chrome/android/java/src/org/chromium/chrome/browser/widget/accessibility/AccessibilityTabModelListItem.java

@@ -41,7 +41,7 @@ public class AccessibilityTabModelListItem extends FrameLayout implements OnClic
     private static final int CLOSE_ANIMATION_DURATION_MS = 100;
     private static final int DEFAULT_ANIMATION_DURATION_MS = 300;
     private static final int VELOCITY_SCALING_FACTOR = 150;
-    private static final int CLOSE_TIMEOUT_MS = 2000;
+    private static final int CLOSE_TIMEOUT_MS = 4000;
 
     private int mCloseAnimationDurationMs;
     private int mDefaultAnimationDurationMs;