Actually enable tab persistence for CCTs.

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabPersistentStore.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabPersistentStore.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabPersistentStore.java b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabPersistentStore.java
index 75e389abe37ce801ecade9a01ac39835fa98c2a5..e55d869e0b8cf847d49ca335982b9c9fb3fabbc4 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabPersistentStore.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabPersistentStore.java
@@ -27,7 +27,6 @@ import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.browser.TabState;
 import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
-import org.chromium.chrome.browser.customtabs.CustomTabDelegateFactory;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabIdManager;
 import org.chromium.content_public.browser.LoadUrlParams;
@@ -691,10 +690,6 @@ public class TabPersistentStore extends TabPersister {
     }
 
     public void addTabToSaveQueue(Tab tab) {
-        // TODO(ianwen): remove this check once we figure out a better plan to disable tab saving.
-        if (tab.getDelegateFactory() instanceof CustomTabDelegateFactory) {
-            return;
-        }
         if (!mTabsToSave.contains(tab) && tab.isTabStateDirty() && !isTabUrlContentScheme(tab)) {
             mTabsToSave.addLast(tab);
         }