Download Home : Fixed multiple crashes

1 - Fixed a bug in partial rebind attempt
2 - Fixed a bug in custom view rebind where view already has a parent

Bug: 870879
Change-Id: I006e2d0f92a038e3b7a44b01b3e7f0c3075ab9b3
Reviewed-on: https://chromium-review.googlesource.com/1162774Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580704}

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/ListPropertyViewBinder.java

@@ -36,7 +36,7 @@ class ListPropertyViewBinder implements ViewBinder<PropertyModel, RecyclerView,
                 || propertyKey == ListProperties.PROVIDER_VISUALS
                 || propertyKey == ListProperties.CALLBACK_SELECTION
                 || propertyKey == ListProperties.SELECTION_MODE_ACTIVE) {
-            view.getAdapter().notifyItemChanged(0, view.getAdapter().getItemCount());
+            view.getAdapter().notifyItemRangeChanged(0, view.getAdapter().getItemCount());
         }
     }
 }
\ No newline at end of file

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/holder/CustomViewHolder.java

@@ -6,6 +6,7 @@ package org.chromium.chrome.browser.download.home.list.holder;
 
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.ViewParent;
 import android.widget.FrameLayout;
 
 import org.chromium.chrome.browser.download.home.list.ListItem;
@@ -31,6 +32,9 @@ public class CustomViewHolder extends ListItemViewHolder {
             return;
         }
 
+        ViewParent parent = viewItem.customView.getParent();
+        if (parent instanceof ViewGroup) ((ViewGroup) parent).removeView(viewItem.customView);
+
         viewGroup.removeAllViews();
         viewGroup.addView(viewItem.customView,
                 new ViewGroup.LayoutParams(