[Downloads] Remove externally deleted items from downloads history

chrome/android/java/src/org/chromium/chrome/browser/download/ui/DownloadManagerToolbar.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/ui/DownloadManagerToolbar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/ui/DownloadManagerToolbar.java b/chrome/android/java/src/org/chromium/chrome/browser/download/ui/DownloadManagerToolbar.java
index bf62f9a7db7e1935e4fe0b7e9cce933db5175ae5..7c605d89ae2638c161342dc2c63af7f9f5c18201 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/ui/DownloadManagerToolbar.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/ui/DownloadManagerToolbar.java
@@ -9,6 +9,7 @@ import android.support.annotation.Nullable;
 import android.support.v4.widget.DrawerLayout;
 import android.util.AttributeSet;
 
+import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.download.ui.DownloadManagerUi.DownloadUiObserver;
 import org.chromium.chrome.browser.widget.selection.SelectionDelegate;
@@ -47,8 +48,14 @@ public class DownloadManagerToolbar extends SelectionToolbar<DownloadHistoryItem
 
     @Override
     public void onSelectionStateChange(List<DownloadHistoryItemWrapper> selectedItems) {
+        boolean wasSelectionEnabled = mIsSelectionEnabled;
         super.onSelectionStateChange(selectedItems);
+
         if (!mIsSelectionEnabled) updateTitle();
+
+        if (mIsSelectionEnabled && !wasSelectionEnabled) {

[qinmin, 2016/08/24 16:30:53]

nit: mIsSelectEnabled appeared twice in the conditions, consider change this to

if (!mIsSelectionEnabled) {
  updateTitle()
} else if (!wasSelectionEnabled) {
   ..................
}

[Theresa, 2016/08/24 22:52:09]

Done.

+            RecordUserAction.record("Android.DownloadManager.SelectionEstablished");
+        }
     }
 
     @Override