[Sync] Restore previous session if no tabbed windows present

chrome/android/java/src/org/chromium/chrome/browser/TabState.java

Index: chrome/android/java/src/org/chromium/chrome/browser/TabState.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/TabState.java b/chrome/android/java/src/org/chromium/chrome/browser/TabState.java
index 72824c006eeab6f5658f3fd6b66c8b0f8a895745..030f592daf0d783fd903acfab111c101ea572971 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/TabState.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/TabState.java
@@ -13,6 +13,7 @@ import android.util.Pair;
 import org.chromium.base.StreamUtil;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.tab.Tab;
+import org.chromium.components.sync.SyncConstants;
 import org.chromium.content.browser.crypto.CipherFactory;
 import org.chromium.content_public.browser.WebContents;
 
@@ -256,9 +257,9 @@ public class TabState {
             try {
                 tabState.syncId = stream.readLong();
             } catch (EOFException eof) {
-                tabState.syncId = 0;
+                tabState.syncId = SyncConstants.INVALID_TAB_NODE_ID;
                 // Could happen if reading a version of TabState without syncId.
-                Log.w(TAG, "Failed to read syncId from tab state. Assuming syncId is: 0");
+                Log.w(TAG, "Failed to read syncId from tab state. Assuming syncId is: -1");
             }
             try {
                 tabState.shouldPreserve = stream.readBoolean();
@@ -484,4 +485,4 @@ public class TabState {
     private static native void nativeFreeWebContentsStateBuffer(ByteBuffer buffer);
 
     private static native void nativeCreateHistoricalTab(ByteBuffer state, int savedStateVersion);
-}
+}