Whitelist Java ToS-accepted pref for backup & restore.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupAgent.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupAgent.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupAgent.java
index 17d71bd33a50c926c285c32722bd24fc02276171..299863812d7f3dead9934f5f51bc86788a2f988e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupAgent.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupAgent.java
@@ -17,6 +17,7 @@ import org.chromium.base.ThreadUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.base.library_loader.ProcessInitException;
+import org.chromium.chrome.browser.firstrun.FirstRunGlueImpl;
 import org.chromium.chrome.browser.firstrun.FirstRunSignInProcessor;
 import org.chromium.chrome.browser.firstrun.FirstRunStatus;
 import org.chromium.chrome.browser.init.ChromeBrowserInitializer;
@@ -46,6 +47,7 @@ public class ChromeBackupAgent extends BackupAgent {
     // Lists of preferences that should be restored unchanged.
 
     static final String[] BACKUP_ANDROID_BOOL_PREFS = {
+            FirstRunGlueImpl.CACHED_TOS_ACCEPTED_PREF,
             FirstRunStatus.FIRST_RUN_FLOW_COMPLETE,
             FirstRunStatus.LIGHTWEIGHT_FIRST_RUN_FLOW_COMPLETE,
             FirstRunSignInProcessor.FIRST_RUN_FLOW_SIGNIN_SETUP,