Remove the tab from the list of tabs so the ImageGrid will update.

I removed this by accident when removing the clearPictureListeners method. This
fixes a NPE when touching a removed tab in the tab picker.

BUG=1816205
diff --git a/src/com/android/browser/ImageAdapter.java b/src/com/android/browser/ImageAdapter.java
index 42d2224..f95753a 100644
--- a/src/com/android/browser/ImageAdapter.java
+++ b/src/com/android/browser/ImageAdapter.java
@@ -100,6 +100,7 @@
      */
     public void remove(int index) {
         if (index >= 0 && index < mItems.size()) {
+            mItems.remove(index);
             notifyObservers();
             mMaxedOut = false;
         }